CN112970220A - Controlling search space overlap indication - Google Patents

Abstract

A User Equipment (UE) receives, from a base station, a quasi-co-located (QCL) Synchronization Signal Block (SSB) of a set of SSBs, the SSB including an indication of a parameter indicating information associated with a plurality of downlink control channel positions corresponding to the set of QCL SSBs. The UE may determine a plurality of downlink control channel positions corresponding to the set of QCL SSBs based at least in part on the parameters. The UE may receive a downlink grant for system information based at least in part on monitoring one or more of the plurality of downlink control channel locations. The UE may receive system information based at least in part on the downlink grant. The UE may establish a connection with the base station based at least in part on the SSB and the received system information.

Description

Controlling search space overlap indication

Cross-referencing

This patent application claims priority to the following applications: U.S. patent application No.16/681,554 entitled "CONTROL SEARCH SPACE OVERLAP INDICATION" filed on 12.11.2019 by SUN et al; and indian provisional patent application No.201841042779 entitled "CONTROL SEARCH SPACE OVERLAP INDICATION" filed by SUN et al on 14/11/2018, both of which are assigned to the assignee of the present application.

Technical Field

The following generally relates to wireless communications, and more particularly to controlling search space overlap indications.

Background

Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems are capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (e.g., Long Term Evolution (LTE) systems or LTE-advanced (LTE-a) systems, or LTE-APro systems) and fifth generation (5G) systems (which may be referred to as New Radio (NR) systems). These systems may employ techniques such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or discrete fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communication system may include multiple base stations or network access nodes that each simultaneously support communication for multiple communication devices, which may otherwise be referred to as User Equipment (UE).

Wireless communication systems typically support a wide variety of communication technologies to support wireless communications between base stations and UEs. For example, the base station may transmit a wide variety of synchronization signals (e.g., Synchronization Signal Blocks (SSBs)) to support acquisition by the UE. In general, the SSB may carry or communicate various parameters associated with the base station that the UE uses to align at least to some extent (e.g., in time, frequency, etc.) with the base station in order to establish a connection between the base station and the UE. Traditionally, base stations typically transmit a limited or defined number of SSBs. In a millimeter wave (mmW) network, a base station may send SSBs in beamformed transmissions in a scanning manner around the coverage area of the base station.

Traditionally, the limited or defined number of SSBs available for transmission supports a one-to-one mapping between the SSBs and various control signal resources. For example, each SSB may have a corresponding set of control signal (e.g., Physical Downlink Control Channel (PDCCH)) resources associated with the SSB, e.g., an index number for an SSB may correspond to a particular PDCCH resource. However, conventional techniques do not support configurations in which additional SSBs may be used for transmission, e.g., conventional techniques may not provide a mechanism for supporting an indication of PDCCH search space overlap. Thus, in situations where additional SSBs are available for transmission, a legacy wireless network may not support mapping multiple SSBs to a particular control channel resource.

Disclosure of Invention

The described technology relates to improved methods, systems, devices and apparatus that support controlling search space overlap indications. In general, the described techniques provide various mechanisms for improving an indication of overlapping control channel positions corresponding to a set of quasi co-located (QCL) Synchronization Signal Blocks (SSBs). For example, the base station may transmit multiple SSBs from the QCL SSB set. In some aspects, each SSB of the SSBs within the plurality of SSBs carries or otherwise communicates an indication of an offset between consecutive SSBs within the set of QCL SSBs. In a broad sense, an offset may refer to a parameter carried or transmitted in an SSB (e.g., a Physical Broadcast Channel (PBCH) portion of the SSB) that allows or otherwise supports control channel location overlap for different SSBs. A User Equipment (UE) may receive one of the SSBs transmitted from the base station and determine an indicated offset. Based on the offset, the UE may determine a plurality of downlink control channel locations (e.g., Physical Downlink Control Channel (PDCCH) locations) corresponding to the QCL SSB set. The UE may receive a downlink grant for a system information signal (e.g., minimum system information Remaining (RMSI)) using the determined downlink control channel position, e.g., by monitoring the downlink control channel position. The UE may receive system information according to the downlink grant and establish a connection with the base station using the system information (e.g., RMSI) and information in the SSB.

In other aspects, the described techniques may support rate matching operations for a UE. For example, system information (e.g., RMSI) may carry or convey a bitmap that indicates the subset of SSBs that are actually being sent from the set of SSBs, e.g., a bit within the bitmap may be set to "1" to indicate that an SSB is sent at that location, and vice versa. In some aspects, the system information may additionally carry or convey an indication of a maximum number of SSBs available for use that is greater than the total number of SSBs in the set of SSBs. For example, the bitmap may be configured to "10101010" to indicate that SSB locations 0, 2, 4, and 6 are actually being sent within the SSB set consisting of SSB locations (or indices) 0-7. The indication of the maximum number of SSBs may be set to the maximum number of SSB locations being used, e.g., 12, 16, 18, or some other maximum number of SSB locations that may be used. In at least some aspects, the UE may configure rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use. In some aspects, this may include the UE having some rule or otherwise repeating the following pattern: the SSBs actually sent (e.g., subset of SSBs within the SSB set), and the SSB locations punctured within the SSB set for the used SSB location, e.g., the UE may repeat the pattern "10101010" for SSB location 8 to the end of the maximum number of SSBs available for use. Accordingly, the UE may receive data transmissions (e.g., Physical Downlink Shared Channel (PDSCH)) transmissions using the configured rate matching.

A method of wireless communication at a UE is described. The method can comprise the following steps: receiving, from a base station, an SSB of a set of QCL SSBs, the SSB including an indication of a parameter indicating information associated with a set of downlink control channel locations corresponding to the set of QCL SSBs; determining a set of downlink control channel locations corresponding to the set of QCL SSBs based on the parameter; receiving a downlink grant for system information based on monitoring one or more downlink control channel locations in a set of downlink control channel locations; receiving system information based on a downlink grant; and establishing a connection with the base station based on the SSB and the received system information.

An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: receiving, from a base station, an SSB of a set of QCL SSBs, the SSB including an indication of a parameter indicating information associated with a set of downlink control channel locations corresponding to the set of QCL SSBs; determining a set of downlink control channel locations corresponding to the set of QCL SSBs based on the parameter; receiving a downlink grant for system information based on monitoring one or more downlink control channel locations in a set of downlink control channel locations; receiving system information based on a downlink grant; and establishing a connection with the base station based on the SSB and the received system information.

Another apparatus for wireless communication at a UE is described. The apparatus may include means for: receiving, from a base station, an SSB of a set of QCL SSBs, the SSB including an indication of a parameter indicating information associated with a set of downlink control channel locations corresponding to the set of QCL SSBs; determining a set of downlink control channel locations corresponding to the set of QCL SSBs based on the parameter; receiving a downlink grant for system information based on monitoring one or more downlink control channel locations in a set of downlink control channel locations; receiving system information based on a downlink grant; and establishing a connection with the base station based on the SSB and the received system information.

A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: receiving, from a base station, an SSB of a set of QCL SSBs, the SSB including an indication of a parameter indicating information associated with a set of downlink control channel locations corresponding to the set of QCL SSBs; determining a set of downlink control channel locations corresponding to the set of QCL SSBs based on the parameter; receiving a downlink grant for system information based on monitoring one or more downlink control channel locations in a set of downlink control channel locations; receiving system information based on a downlink grant; and establishing a connection with the base station based on the SSB and the received system information.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the parameter comprises an indication of an offset between consecutive SSBs within the set of QCL SSBs.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving an SSB may include operations, features, units, or instructions to: a PBCH portion of the SSB is received, the PBCH portion of the SSB including an indication of the parameters.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving a PBCH portion of a synchronization block may include operations, features, units, or instructions to: soft combining across the set of SSBs is performed.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the indication of the parameter may be common across each SSB in the set of SSBs.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the set of SSBs includes at least one of: a set of QCL SSBs, a set of different sets of QCL SSBs, each SSB associated with a base station, or a combination thereof.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: an index of each SSB in the set of QCL SSBs is determined, and wherein determining the set of downlink control channel positions may be based on the determined index of each SSB in the set of QCL SSBs.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: determining the set of downlink control channel locations may be based on a frame in which the SSB may be received and parameters indicated in the SSB.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving a downlink grant may include operations, features, units, or instructions to: each downlink control channel location in the set of downlink control channel locations is monitored.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving a downlink grant may include operations, features, units, or instructions to: determining that no downlink control information is detected during a first instance in the set of downlink control channel locations; and monitoring a second instance of the set of downlink control channel locations based on the parameter to detect the downlink grant.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the downlink control channel positions in the set of downlink control channel positions comprise PDCCH common search spaces of type 0.

A method of wireless communication at a base station is described. The method can comprise the following steps: transmitting a set of SSBs, the set of SSBs comprising a set of QCL SSBs, wherein each SSB in the set of SSBs comprises an indication of a parameter indicating information associated with a set of downlink control channel locations corresponding to the set of QCL SSBs; transmitting a downlink grant for system information on a set of downlink control channel positions corresponding to the set of QCL SSBs based on the parameter; transmitting system information according to the authorization; and establishing a connection with the UE based on the SSB and the system information.

An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: transmitting a set of SSBs, the set of SSBs comprising a set of QCL SSBs, wherein each SSB in the set of SSBs comprises an indication of a parameter indicating information associated with a set of downlink control channel locations corresponding to the set of QCL SSBs; transmitting a downlink grant for system information on a set of downlink control channel positions corresponding to the set of QCL SSBs based on the parameter; transmitting system information according to the authorization; and establishing a connection with the UE based on the SSB and the system information.

Another apparatus for wireless communication at a base station is described. The apparatus may include means for: transmitting a set of SSBs, the set of SSBs comprising a set of QCL SSBs, wherein each SSB in the set of SSBs comprises an indication of a parameter indicating information associated with a set of downlink control channel locations corresponding to the set of QCL SSBs; transmitting a downlink grant for system information on a set of downlink control channel positions corresponding to the set of QCL SSBs based on the parameter; transmitting system information according to the authorization; and establishing a connection with the UE based on the SSB and the system information.

A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to: transmitting a set of SSBs, the set of SSBs comprising a set of QCL SSBs, wherein each SSB in the set of SSBs comprises an indication of a parameter indicating information associated with a set of downlink control channel locations corresponding to the set of QCL SSBs; transmitting a downlink grant for system information on a set of downlink control channel positions corresponding to the set of QCL SSBs based on the parameter; transmitting system information according to the authorization; and establishing a connection with the UE based on the SSB and the system information.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the parameter comprises an indication of an offset between consecutive SSBs within the set of QCL SSBs.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the set of SSBs may include operations, features, units, or instructions to: the PBCH portion of the SSB is sent, and the physical broadcast portion of the SSB includes an indication of the parameters.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the indication of the parameter may be common across each SSB in the set of SSBs.

A method of wireless communication at a UE is described. The method can comprise the following steps: receiving system information comprising a bitmap indicating a subset of SSBs transmitted from a set of SSBs, the system information signal further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs; configuring rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use; and receiving the PDSCH transmission based on rate matching.

An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: receiving system information comprising a bitmap indicating a subset of SSBs transmitted from a set of SSBs, the system information signal further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs; configuring rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use; and receiving the PDSCH transmission based on rate matching.

Another apparatus for wireless communication at a UE is described. The apparatus may include means for: receiving system information comprising a bitmap indicating a subset of SSBs transmitted from a set of SSBs, the system information signal further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs; configuring rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use; and receiving the PDSCH transmission based on rate matching.

A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: receiving system information comprising a bitmap indicating a subset of SSBs transmitted from a set of SSBs, the system information signal further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs; configuring rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use; and receiving the PDSCH transmission based on rate matching.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, configuring rate matching may include operations, features, units, or instructions to: the pattern in the bitmap is repeated for a subset of SSBs within the set of SSBs and for SSBs that occur after the subset of SSBs and that are within the maximum number of SSBs available for use.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving system information may include operations, features, units, or instructions to: receiving a previous PDSCH transmission including system information; and decoding the system information to identify a bitmap, wherein the rate matching may not be performed on a previous PDSCH.

In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, PDSCH transmissions may be received during the same discovery period in which the maximum number of SSBs available for use may be transmitted.

A method of wireless communication at a base station is described. The method can comprise the following steps: transmitting system information including a bitmap indicating a subset of SSBs transmitted from a set of SSBs, the system information further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs; configuring rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use; and performing PDSCH transmission based on rate matching.

An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: transmitting system information including a bitmap indicating a subset of SSBs transmitted from a set of SSBs, the system information further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs; configuring rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use; and performing PDSCH transmission based on rate matching.

Another apparatus for wireless communication at a base station is described. The apparatus may include means for: transmitting system information including a bitmap indicating a subset of SSBs transmitted from a set of SSBs, the system information further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs; configuring rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use; and performing PDSCH transmission based on rate matching.

A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to: transmitting system information including a bitmap indicating a subset of SSBs transmitted from a set of SSBs, the system information further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs; configuring rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use; and performing PDSCH transmission based on rate matching.

Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions to: the pattern in the bitmap is repeated for sending a subset of SSBs within the set of SSBs, and an additional set of SSBs sent after the subset of SSBs and within the maximum number of SSBs available for use.

In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting system information may include operations, features, units, or instructions for: a previous PDSCH transmission including system information is performed.

Drawings

Fig. 1 illustrates an example of a system for wireless communication that supports controlling search space overlap indication in accordance with aspects of the present disclosure.

Fig. 2 illustrates an example of a wireless communication system that supports controlling search space overlap indication in accordance with aspects of the present disclosure.

Fig. 3 illustrates an example of an SSB configuration that supports controlling search space overlap indication, in accordance with aspects of the present disclosure.

Fig. 4A and 4B illustrate examples of SSB configurations that support controlling search space overlap indications, in accordance with aspects of the present disclosure.

Fig. 5 illustrates an example of a process that supports controlling search space overlap indication according to aspects of the present disclosure.

Fig. 6 illustrates an example of a process that supports controlling search space overlap indication according to aspects of the present disclosure.

Fig. 7 and 8 show block diagrams of devices that support controlling search space overlap indication according to aspects of the present disclosure.

Fig. 9 illustrates a block diagram of a communications manager that supports controlling search space overlap indications, in accordance with aspects of the present disclosure.

Fig. 10 illustrates a diagram of a system including a device that supports controlling search space overlap indications, in accordance with aspects of the present disclosure.

Fig. 11 and 12 show block diagrams of devices that support controlling search space overlap indication, according to aspects of the present disclosure.

Fig. 13 illustrates a block diagram of a communications manager that supports controlling search space overlap indications in accordance with aspects of the present disclosure.

Fig. 14 shows a diagram of a system including a device that supports controlling search space overlap indication, in accordance with aspects of the present disclosure.

Fig. 15-18 show flow diagrams illustrating methods of supporting control of search space overlap indication according to aspects of the present disclosure.

Detailed Description

Wireless communication systems typically support a wide variety of communication technologies to support wireless communications between base stations and User Equipment (UE). For example, the base station may transmit a wide variety of synchronization signals (e.g., Synchronization Signal Blocks (SSBs)) to support acquisition by the UE. In general, the SSB may carry or communicate various parameters associated with the base station that the UE uses to align at least to some extent (e.g., in time, frequency, etc.) with the base station in order to establish a connection between the base station and the UE. Traditionally, base stations typically transmit a limited or defined number of SSBs. In a millimeter wave (mmW) network, a base station may send SSBs in beamformed transmissions in a scanning manner around the coverage area of the base station.

Traditionally, the limited or defined number of SSBs available for transmission supports a one-to-one mapping between the SSBs and various control signal resources. For example, each SSB may have a corresponding set of control signal (e.g., Physical Downlink Control Channel (PDCCH)) resources associated with the SSB, e.g., an index number for an SSB may correspond to a particular PDCCH resource. However, the conventional technique does not support the following configuration: where additional SSBs may be used for transmission and certain SSBs may not be sent due to the results of Listen Before Talk (LBT) procedures on carriers that require LBT procedures to be performed prior to transmission, for example, conventional techniques may not provide a mechanism for supporting an indication of PDCCH search space overlap. Thus, in situations where additional SSBs are available for transmission, a legacy wireless network may not support mapping multiple SSBs to a particular control channel resource.

Aspects of the present disclosure are first described in the context of a wireless communication system. The described technology relates to improved methods, systems, devices and apparatus that support controlling search space overlap indications. In general, the described techniques provide various mechanisms for improving an indication of overlapping control channel positions corresponding to a set of quasi co-located (QCL) Synchronization Signal Blocks (SSBs). For example, the base station may transmit multiple SSBs from the QCL SSB set. The SSBs selected for transmission from the set of QCL SSBs may be based on the results of the LBT procedure. In some aspects, each SSB of the SSBs within the plurality of SSBs carries or otherwise communicates an indication of an offset between consecutive SSBs within the set of QCL SSBs. In a broad sense, an offset may refer to a parameter carried or transmitted in an SSB (e.g., a Physical Broadcast Channel (PBCH) portion of the SSB) that allows or otherwise supports control channel location overlap for different SSBs. The UE may receive one of the SSBs transmitted from the base station and determine the indicated offset. Based on the offset, the UE may determine a plurality of downlink control channel locations (e.g., Physical Downlink Control Channel (PDCCH) locations) corresponding to the QCL SSB set. The UE may receive a downlink grant for a system information signal (e.g., minimum system information Remaining (RMSI)) using the determined downlink control channel position, e.g., by monitoring the downlink control channel position. The UE may receive system information according to the downlink grant and establish a connection with the base station using the system information (e.g., RMSI) and information in the SSB.

In other aspects, the described techniques may support rate matching operations for a UE. For example, system information (e.g., RMSI) may carry or convey a bitmap that indicates the subset of SSBs that are actually being sent from the set of SSBs, e.g., a bit within the bitmap may be set to "1" to indicate that an SSB is sent at that location, and vice versa. In some aspects, the system information may additionally carry or convey an indication of a maximum number of SSBs available for use that is greater than the total number of SSBs in the set of SSBs. For example, the bitmap may be configured to "10101010" to indicate that SSB locations 0, 2, 4, and 6 are actually being sent within the SSB set consisting of SSB locations (or indices) 0-7. The indication of the maximum number of SSBs may be set to the maximum number of SSB locations being used, e.g., 12, 16, 18, or some other maximum number of SSB locations that may be used. In at least some aspects, the UE may configure rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use. In some aspects, this may include the UE having some rule or otherwise repeating the following pattern: the SSBs actually sent (e.g., subset of SSBs within the SSB set), and the SSB locations punctured within the SSB set for the used SSB location, e.g., the UE may repeat the pattern "10101010" for SSB location 8 to the end of the maximum number of SSBs available for use. Accordingly, the UE may receive data transmissions (e.g., Physical Downlink Shared Channel (PDSCH)) transmissions using the configured rate matching.

Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flow charts related to controlling search space overlap indications.

Fig. 1 illustrates an example of a wireless communication system 100 that supports controlling search space overlap indications in accordance with an aspect of the disclosure. The wireless communication system 100 includes base stations 105, UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an LTE-advanced (LTE-a) network, an LTE-a Pro network, or a New Radio (NR) network. In some cases, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, or communications with low cost and low complexity devices.

The base station 105 may communicate wirelessly with the UE115 via one or more base station antennas. The base stations 105 described herein may include or may be referred to by those skilled in the art as base station transceivers, wireless base stations, access points, wireless transceivers, node bs, evolved node bs (enbs), next generation node bs or gigabit node bs (any of which may be referred to as gnbs), home node bs, home evolved node bs, or some other suitable terminology. The wireless communication system 100 may include different types of base stations 105 (e.g., macro base stations or small cell base stations). The UE115 described herein is capable of communicating with various types of base stations 105 and network devices, including macro enbs, small cell enbs, gnbs, relay base stations, and the like.

Each base station 105 may be associated with a particular geographic coverage area 110 in which communications with various UEs 115 are supported. Each base station 105 may provide communication coverage for a respective geographic coverage area 110 via a communication link 125, and the communication link 125 between the base station 105 and the UE115 may utilize one or more carriers. The communication links 125 shown in the wireless communication system 100 may include: uplink transmissions from the UE115 to the base station 105, or downlink transmissions from the base station 105 to the UE 115. Downlink transmissions may also be referred to as forward link transmissions, and uplink transmissions may also be referred to as reverse link transmissions.

The geographic coverage area 110 for a base station 105 can be divided into sectors that form a portion of the geographic coverage area 110, and each sector can be associated with a cell. For example, each base station 105 may provide communication coverage for a macro cell, a small cell, a hot spot, or other type of cell, or various combinations thereof. In some examples, the base stations 105 may be mobile and, thus, provide communication coverage for a moving geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, and the overlapping geographic coverage areas 110 associated with different technologies may be supported by the same base station 105 or different base stations 105. The wireless communication system 100 may include: for example, a heterogeneous LTE/LTE-A/LTE-A Pro or NR network, where different types of base stations 105 provide coverage for various geographic coverage areas 110.

The term "cell" refers to a logical communication entity used for communication with the base station 105 (e.g., on a carrier) and may be associated with an identifier (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID)) used to distinguish between neighbor cells operating via the same or different carriers. In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., Machine Type Communication (MTC), narrowband internet of things (NB-IoT), evolved mobile broadband (eMBB), or other protocol types) that may provide access for different types of devices. In some cases, the term "cell" may refer to a portion (e.g., a sector) of geographic coverage area 110 over which a logical entity operates.

UEs 115 may be dispersed throughout the wireless communication system 100, and each UE115 may be stationary or mobile. The UE115 may also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a user equipment, or some other suitable terminology, where a "device" may also be referred to as a unit, station, terminal, or client. The UE115 may also be a personal electronic device, such as a cellular telephone, a Personal Digital Assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, the UE115 may also refer to a Wireless Local Loop (WLL) station, an internet of things (IoT) device, an internet of everything (IoE) device, or an MTC device, etc., which may be implemented in various items such as appliances, vehicles, meters, etc.

Some UEs 115 (e.g., MTC or IoT devices) may be low cost or low complexity devices and may provide automated communication between machines (e.g., communication via machine-to-machine (M2M)). M2M communication or MTC may refer to data communication techniques that allow devices to communicate with each other or base station 105 without human intervention. In some examples, M2M communications or MTC may include communications from devices that incorporate sensors or meters to measure or capture information and relay that information to a central server or application that may utilize the information or present the information to a human interacting with the program or application. Some UEs 115 may be designed to collect information or implement automated behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, device monitoring, healthcare monitoring, wildlife monitoring, climate and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based service billing.

Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communications (e.g., a mode that supports unidirectional communication via transmission or reception, but does not support simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for the UE115 include: enter a power-saving "deep sleep" mode when not engaged in active communication, or operate on a limited bandwidth (e.g., in accordance with narrowband communication). In some cases, the UE115 may be designed to support critical functions (e.g., mission critical functions), and the wireless communication system 100 may be configured to provide ultra-reliable communication for these functions.

In some cases, the UE115 may also be able to communicate directly with other UEs 115 (e.g., using peer-to-peer (P2P) or device-to-device (D2D) protocols). One or more UEs 115 in the group of UEs 115 communicating with D2D may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or otherwise unable to receive transmissions from the base station 105. In some cases, a group of UEs 115 communicating via D2D may utilize a one-to-many (1: M) system, where each UE115 transmits to every other UE115 in the group. In some cases, the base station 105 facilitates scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving base stations 105.

The base stations 105 may communicate with the core network 130 and with each other. For example, the base stations 105 may interface with the core network 130 over backhaul links 132 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 may communicate with each other directly (e.g., directly between base stations 105) or indirectly (e.g., via the core network 130) over a backhaul link 134 (e.g., via an X2, Xn, or other interface).

The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an Evolved Packet Core (EPC) that may include at least one Mobility Management Entity (MME), at least one serving gateway (S-GW), and at least one Packet Data Network (PDN) gateway (P-GW). The MME may manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the EPC. User IP packets may be transported through the S-GW, which may itself be connected to the P-GW. The P-GW may provide IP address assignment as well as other functions. The P-GW may be connected to a network operator IP service. Operator IP services may include access to the internet, intranets, IP Multimedia Subsystem (IMS), or Packet Switched (PS) streaming services.

At least some of the network devices (e.g., base stations 105) may include subcomponents such as access network entities, which may be examples of Access Node Controllers (ANCs). Each access network entity may communicate with the UE115 through a plurality of other access network transport entities, which may be referred to as radio heads, intelligent radio heads, or transmission/reception points (TRPs). In some configurations, the various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or consolidated into a single network device (e.g., base station 105).

The wireless communication system 100 may operate using one or more frequency bands, which are typically in the range of 300MHz to 300 GHz. Generally, the region from 300 megahertz (MHz) to 3 gigahertz (GHz) is referred to as the Ultra High Frequency (UHF) region or decimeter band, since the wavelength range is from about one decimeter to one meter in length. UHF waves may be blocked or redirected by building and environmental features. However, the waves may penetrate the structure sufficiently for the macro cell to provide service to the UE115 located indoors. UHF-wave transmission can be associated with smaller antennas and shorter distances (e.g., less than 100km) compared to transmission of smaller frequencies and longer wavelengths using the High Frequency (HF) or Very High Frequency (VHF) portions of the spectrum below 300 MHz.

The wireless communication system 100 may also operate in the ultra-high frequency (SHF) region using a frequency band from 3GHz to 30GHz, which is also referred to as a centimeter band. SHF areas include frequency bands, such as the 5GHz industrial, scientific, and medical (ISM) band, which can be used opportunistically by devices that can tolerate interference from other users.

The wireless communication system 100 may also operate in the Extremely High Frequency (EHF) region of the spectrum, e.g., from 30GHz to 300GHz (also referred to as the millimeter-wave band). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communication between the UE115 and the base station 105, and the EHF antenna of the respective device may be even smaller and more compact than the UHF antenna. In some cases, this may facilitate the use of antenna arrays within the UE 115. However, the propagation of EHF transmissions may suffer from greater atmospheric attenuation and shorter transmission distances than SHF or UHF transmissions. Transmissions across the use of one or more different frequency regions may employ the techniques disclosed herein, and the designated use of frequency bands across these frequency regions may differ due to country or regulatory bodies.

In some cases, the wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ Licensed Assisted Access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band (e.g., the 5GHz ISM band). When operating in the unlicensed radio frequency spectrum band, wireless devices (e.g., base stations 105 and UEs 115) may employ a listen-before-talk (LBT) procedure to ensure that frequency channels are free before transmitting data. In some cases, operation in the unlicensed band may be based on a carrier aggregation configuration in conjunction with component carriers operating in the licensed band (e.g., LAA). Operations in the unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these. Duplexing in the unlicensed spectrum may be based on Frequency Division Duplexing (FDD), Time Division Duplexing (TDD), or a combination of both.

In some examples, a base station 105 or UE115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. For example, the wireless communication system 100 may use a transmission scheme between a transmitting device (e.g., base station 105) and a receiving device (e.g., UE 115), where the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas. MIMO communication may employ multipath signal propagation to improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing. For example, a transmitting device may transmit multiple signals via different antennas or different combinations of antennas. Likewise, a receiving device may receive multiple signals via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams. Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO techniques may include single-user MIMO (SU-MIMO), in which multiple spatial layers are transmitted to the same receiving device, and multi-user MIMO (MU-MIMO), in which multiple spatial layers are transmitted to multiple devices.

Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., base station 105 or UE 115) to shape or steer an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by: signals transmitted via the antenna elements of the antenna array are combined such that signals propagating in a particular orientation with respect to the antenna array undergo constructive interference, while other signals undergo destructive interference. The adjustment of the signal transmitted via the antenna element may comprise: a transmitting device or a receiving device applies some amplitude and phase offset to signals carried via each of the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a set of beamforming weights associated with a particular orientation (e.g., with respect to an antenna array of a transmitting device or a receiving device, or with respect to some other orientation).

In one example, the base station 105 may use multiple antennas or antenna arrays for beamforming operations for directional communication with the UE 115. For example, the base station 105 may transmit some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) multiple times in different directions, which may include: signals are transmitted according to different sets of beamforming weights associated with different transmission directions. The transmissions in the different beam directions may be used (e.g., by the base station 105 or by a receiving device such as the UE 115) to identify beam directions for subsequent transmission and/or reception by the base station 105.

Some signals (e.g., data signals associated with a particular receiving device) may be transmitted by the base station 105 in a single beam direction (e.g., a direction associated with a receiving device such as the UE 115). In some examples, a beam direction associated with a transmission along a single beam direction may be determined based at least in part on signals transmitted in different beam directions. For example, the UE115 may receive one or more of the signals transmitted by the base station 105 in different directions, and the UE115 may report to the base station 105 an indication of the signal received by the UE115 that has the highest signal quality or otherwise acceptable signal quality. Although the techniques are described with reference to signals transmitted by the base station 105 in one or more directions, the UE115 may use similar techniques for transmitting signals multiple times in different directions (e.g., for identifying beam directions for subsequent transmission or reception by the UE 115), or transmitting signals in a single direction (e.g., for transmitting data to a receiving device).

When receiving various signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) from the base station 105, a receiving device (e.g., UE115, which may be an example of a mmW receiving device) may attempt multiple receive beams. For example, the receiving device may attempt multiple receive directions by receiving via different antenna sub-arrays, by processing received signals according to different antenna sub-arrays, by receiving according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array (any of the above operations may be referred to as "listening" according to different receive beams or receive directions). In some examples, a receiving device may use a single receive beam to receive along a single beam direction (e.g., when receiving data signals). The single receive beam may be aligned in a beam direction determined based at least in part on listening from different receive beam directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio, or otherwise acceptable signal quality based at least in part on listening from multiple beam directions).

In some cases, the antennas of a base station 105 or UE115 may be located within one or more antenna arrays that may support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some cases, the antennas or antenna arrays associated with the base station 105 may be located at different geographic locations. The base station 105 may have an antenna array with multiple rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with the UEs 115. Likewise, the UE115 may have one or more antenna arrays that may support various MIMO or beamforming operations.

In some cases, the wireless communication system 100 may be a packet-based network operating according to a layered protocol stack. In the user plane, communications at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based. The Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate on logical channels. A Medium Access Control (MAC) layer may perform priority processing and multiplexing of logical channels to transport channels. The MAC layer may also use Hybrid Automatic Retransmission (HARQ) to provide retransmissions at the MAC layer to improve link efficiency. In the control plane, a Radio Resource Control (RRC) protocol layer may provide for the establishment, configuration, and maintenance of an RRC connection between the UE115 and the base station 105 or core network 130 that supports radio bearers for user plane data. At the physical layer, transport channels may be mapped to physical channels.

In some cases, the UE115 and the base station 105 may support retransmission of data to increase the likelihood that the data is successfully received. HARQ feedback is a technique that increases the likelihood that data will be received correctly on the communication link 125. HARQ may include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), Forward Error Correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ may improve throughput at the MAC layer under poor radio conditions (e.g., signal and noise conditions). In some cases, the wireless device may support HARQ feedback for the same slot, where the device may provide HARQ feedback for data received in a previous symbol in the slot in a particular slot. In other cases, the device may provide HARQ feedback in subsequent time slots or according to some other time interval.

May be in basic time units (which may for example refer to T)_sA sampling period of 1/30,720,000 seconds) to represent the time interval in LTE or NR. The time intervals of the communication resources may be organized according to radio frames each having a duration of 10 milliseconds (ms), where the frame period may be denoted as T_f＝307,200T_s. The radio frames may be identified by a System Frame Number (SFN) ranging from 0 to 1023. Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 ms. The sub-frame may be further divided into 2 slots, each having a duration of 0.5ms, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix added in front of each symbol period). Each symbol period may contain 2048 sample periods, excluding the cyclic prefix. In some cases, a subframe may be the smallest scheduling unit of the wireless communication system 100 and may be referred to as a Transmission Time Interval (TTI). In other cases, the minimum scheduling unit of the wireless communication system 100 may be shorter than a subframe or may be dynamically selected (e.g., in a burst of shortened ttis (sTTI) or in a selected using sTTI)In a component carrier).

In some wireless communication systems, a slot may be further divided into a plurality of minislots comprising one or more symbols. In some examples, the symbol of the mini-slot or the mini-slot may be the minimum scheduling unit. Each symbol may vary in duration depending on, for example, the subcarrier spacing or frequency band of operation. Further, some wireless communication systems may implement timeslot aggregation, where multiple timeslots or minislots are aggregated together and used for communication between the UE115 and the base station 105.

The term "carrier" refers to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communication over the communication link 125. For example, the carrier of the communication link 125 may include a portion of the radio frequency spectrum band that operates according to physical layer channels for a given radio access technology. Each physical layer channel may carry user data, control information, or other signaling. The carriers may be associated with predefined frequency channels (e.g., evolved universal mobile telecommunications system terrestrial radio access (E-UTRA) absolute radio frequency channel numbers (EARFCNs)) and may be placed according to a channel grid for discovery by UEs 115. The carriers may be downlink or uplink (e.g., in FDD mode), or may be configured to carry downlink and uplink communications (e.g., in TDD mode). In some examples, the signal waveforms transmitted on the carriers may be composed of multiple subcarriers (e.g., using multicarrier modulation (MCM) techniques such as Orthogonal Frequency Division Multiplexing (OFDM) or discrete fourier transform spread OFDM (DFT-S-OFDM)).

The organization of the carriers may be different for different radio access technologies (e.g., LTE-A, LTE-A Pro, NR). For example, communications over carriers may be organized according to TTIs or slots, each of which may include user data as well as control information or signaling to support decoding of the user data. The carriers may also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc.) and control signaling that coordinates operation for the carriers. In some examples (e.g., in a carrier aggregation configuration), a carrier may also have control signaling to acquire signaling or coordinate operations for other carriers.

The physical channels may be multiplexed on the carriers according to various techniques. For example, physical control channels and physical data channels may be multiplexed on a downlink carrier using Time Division Multiplexing (TDM) techniques, Frequency Division Multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. In some examples, the control information sent in the physical control channel may be distributed in a cascaded manner between different control regions (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces).

The carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the carrier or "system bandwidth" of the wireless communication system 100. For example, the carrier bandwidth may be one of a plurality of predetermined bandwidths (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80MHz) of the carrier for the particular wireless access technology. In some examples, each served UE115 may be configured to operate over part or all of the carrier bandwidth. In other examples, some UEs 115 may be configured for operation using a narrowband protocol type associated with a predefined portion or range within a carrier (e.g., a set of subcarriers or RBs) (e.g., an "in-band" deployment of the narrowband protocol type).

In a system employing MCM technology, a resource element may consist of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme). Thus, the more resource elements the UE115 receives and the higher the order of the modulation scheme, the higher the data rate may be for the UE 115. In a MIMO system, wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers), and the use of multiple spatial layers may further increase the data rate for communication with the UE 115.

Devices of the wireless communication system 100 (e.g., base stations 105 or UEs 115) may have a hardware configuration that supports communication over a particular carrier bandwidth or may be configurable to support communication over one carrier bandwidth of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 and/or a UE115 that support simultaneous communication via carriers associated with more than one different carrier bandwidth.

The wireless communication system 100 may support communication with UEs 115 over multiple cells or carriers (a feature that may be referred to as carrier aggregation or multi-carrier operation). According to a carrier aggregation configuration, a UE115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used with both FDD and TDD component carriers.

In some cases, the wireless communication system 100 may use an enhanced component carrier (eCC). An eCC may be characterized by one or more features, including: a wider carrier or frequency channel bandwidth, a shorter symbol duration, a shorter TTI duration, or a modified control channel configuration. In some cases, an eCC may be associated with a carrier aggregation configuration or a dual connectivity configuration (e.g., when multiple serving cells have suboptimal or undesirable backhaul links). An eCC may also be configured for unlicensed spectrum or shared spectrum (e.g., where more than one operator is allowed to use the spectrum). An eCC featuring a wide carrier bandwidth may include one or more segments that may be used by UEs 115 that cannot monitor the entire carrier bandwidth or are otherwise configured to use a limited carrier bandwidth (e.g., to conserve power).

In some cases, an eCC may use a different symbol duration than other component carriers, which may include using a reduced symbol duration compared to the symbol duration of the other component carriers. Shorter symbol durations may be associated with increased spacing between adjacent subcarriers. A device using an eCC, such as a UE115 or a base station 105, may transmit a wideband signal (e.g., according to a frequency channel or carrier bandwidth of 20MHz, 40MHz, 60MHz, 80MHz, etc.) with a reduced symbol duration (e.g., 16.67 microseconds). A TTI in an eCC may consist of one or more symbol periods. In some cases, the TTI duration (i.e., the number of symbol periods in a TTI) may be variable.

The wireless communication system 100 may be an NR system that may utilize any combination of licensed, shared, and unlicensed frequency bands, among others. Flexibility in eCC symbol duration and subcarrier spacing may allow eCC to be used across multiple spectra. In some examples, NR sharing spectrum may increase spectral utilization and spectral efficiency, particularly through dynamic vertical (e.g., across frequency domains) and horizontal (e.g., across time domains) sharing of resources.

In some aspects, the UE115 may receive an SSB of a set of QCL SSBs from the base station 105, the SSB including an indication of a parameter indicating information associated with a plurality of downlink control channel positions corresponding to the set of QCL SSBs. The UE115 may determine a plurality of downlink control channel positions corresponding to the set of QCL SSBs based at least in part on the parameters. The UE115 may receive a downlink grant for system information based at least in part on monitoring one or more of a plurality of downlink control channel locations. The UE115 may receive system information based at least in part on the downlink grant. The UE115 may establish a connection with the base station 105 based at least in part on the SSB and the received system information block.

In some aspects, the base station 105 may transmit a plurality of SSBs, the plurality of SSBs including a set of QCL SSBs, wherein each SSB of the plurality of SSBs includes an indication of a parameter indicating information associated with a plurality of downlink control channel positions corresponding to the set of QCL SSBs. The base station 105 may send a downlink grant for system information on a plurality of downlink control channel positions corresponding to the set of QCL SSBs based at least in part on the parameters. The base station 105 may transmit system information according to the authorization. The base station 105 may establish a connection with the UE115 based at least in part on the synchronization signal block and the system information.

In some aspects, the UE115 may receive system information comprising a bitmap indicating a subset of SSBs transmitted from a set of SSBs, the system information signal further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs. The UE115 may configure rate matching based at least in part on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use. The UE115 may receive the PDSCH transmission based at least in part on rate matching.

In some aspects, the base station 105 may transmit system information including a bitmap indicating a subset of SSBs transmitted from the set of SSBs, the system information further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs. The base station 105 may configure rate matching based at least in part on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs being used. The base station 105 may perform PDSCH transmission based at least in part on rate matching.

Fig. 2 illustrates an example of a wireless communication system 200 that supports controlling search space overlap indications in accordance with aspects of the present disclosure. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100. In some examples, the wireless communication system 200 may include a base station 205 and a UE 210, which may be examples of corresponding devices described herein. In some examples, the base station 205 may be considered a potential or current serving base station from the perspective of the UE 210.

In some aspects, the wireless communication system 200 may be configured to support various aspects of the described techniques for controlling search space overlap indication. In general, legacy networks typically define a one-to-one correspondence between SSBs and downlink control channel indications (e.g., PDCCH locations). For example, each SSB may have an associated index, and the index may correspond to or otherwise be associated with a particular downlink control channel location (e.g., such as a location of a control channel used to carry grants for additional system information). A UE attempting to establish a connection with the base station 205, such as UE 210, will typically monitor and detect the SSB with an associated index and identify a corresponding downlink control channel location based on the index of the SSB. As one non-limiting example, an initial access UE (e.g., UE 210) may detect an SSB with an index of 5. The initial access UE may know: SSB index 5 corresponds to a particular downlink control channel location, e.g., based on a lookup table or some other configured information. The initial access UE may monitor the downlink control channel location corresponding to SSB index 5 to receive a downlink grant for resources used to carry additional system information, e.g., resources for the PDSCH carrying RMSI (which may also be referred to as RMSI PDSCH). Conventionally, the location of the downlink control channel may be carried or transmitted in a bit or field of a broadcast channel, such as a Physical Broadcast Channel (PBCH), of the base station 205.

However, in some configurations, such conventional techniques may not be available. For example, in some aspects, the number of SSBs available or otherwise available to the base station 205 may exceed the number of available downlink control channel locations, e.g., and thus, one-to-one mapping techniques may not be available. Further, in mmW networks, the base station 205 may transmit the SSB of the base station 205 using beamformed transmissions that are transmitted in a scanning manner within the coverage area of the base station 205. In some aspects, this may include the base station 205 transmitting more than the available corresponding downlink control channel locations within the coverage area of the base station 205. However, it is to be understood that QCL SSB is not limited to mmW networks and may, instead, involve non-mmW networks.

Furthermore, some wireless networks may operate in a shared or unlicensed radio frequency spectrum band, where a Listen Before Talk (LBT) procedure must be performed on the channel before any transmission may occur. In this example, the LBT procedure performed by the base station 205 may be unsuccessful for some instances of configured SSB transmissions, which may further introduce confusion into the network.

In some aspects, the SSBs may be transmitted within a particular discovery period (e.g., such as a Discovery Reference Signal (DRS) period). Again, in some examples, the LBT procedure may be successful for some SSB transmissions within the DRS period, but may be unsuccessful for other SSB transmissions within the DRS period. Thus, depending on the outcome of the LBT procedure, the pattern of configured SSB transmissions may be interrupted within the DRS, e.g., based on the success or failure of the LBT procedure. Accordingly, aspects of the described technology provide the following mechanisms: wherein the base station 205 and/or the UE 210 can support an overlapping (e.g., many-to-one) relationship between the plurality of SSB indices corresponding to downlink control channel positions.

For example, the base station 205 may support multiple SSBs 215 available for transmission. In some aspects, this may include sending the set of QCL SSBs in a beamformed transmission in a scanning manner around the coverage area of the base station 205. For example, a first SSB215-a may be transmitted in a first beamformed direction, a second SSB 215-b may be transmitted in a second beamformed direction, a third SSB 215-c may be transmitted in a third beamformed direction, a fourth SSB 215-d may be transmitted in a fourth beamformed direction, a fifth SSB 215-e may be transmitted in a fifth beamformed direction, and so on. In a broad sense, each SSB215 may carry or communicate an indication of some synchronization information that may be used by an initial access UE (e.g., UE 210) that is seeking a base station to connect to. For example, each SSB215 may carry or communicate synchronization information (e.g., timing information, frequency information, spatial information, etc.). The initial access UE may use this information to detect or otherwise receive additional system information from the base station 205 in order to establish a connection between the base station 205 and the initial access UE. Accordingly, the base station 205 may transmit multiple SSBs 215, where at least one SSB215 (e.g., SSB 215-d) of the SSBs 215 may be detected or otherwise received by the UE 210.

In accordance with aspects of the described techniques, SSBs 215 transmitted by base station 205 may include or otherwise form a set of QCL SSBs. For example, base station 205 may transmit multiple instances of SSB215 within a defined period (such as a DRS period), within a certain number of slots/frames, and so on. In some aspects, the set of QCL SSBs may consist of SSBs 215 having the same (or substantially similar) QCL configuration. For example and when the base station 205 transmits the SSBs 215 twice in a scanning manner within a time period, two instances of the SSBs 215-d may be considered a QCL SSB set. In the example where the base station 205 transmits the SSB215 three times within a time period, three instances of the SSB 215-d may be considered a QCL SSB set. Thus, the base station 205 may transmit multiple SSBs 215 (e.g., SSBs 215-a, 215-b, 215-c, 215-d, and 215-e) in a repeating manner such that the set of QCL SSBs 215 may include multiple instances of the same SSB215 (e.g., multiple instances of SSB 215-d) being transmitted. However, it is to be understood that each instance of SSB215 within the QCL SSB set will have its own index number. For example, a first instance of SSB 215-d may have an index of 0, while the next instance of SSB 215-d may have an index of 4 (or some other pattern). In some aspects, the transmitting SSB215 may also have a broadcast channel, such as a Physical Broadcast Channel (PBCH) portion of the SSB 215.

In some aspects, each SSB215 sent by the base station 205 may also carry or communicate an indication of a parameter indicating or otherwise communicating information associated with a plurality of downlink control channel positions corresponding to a set of QCL SSBs. In some aspects, the parameter (e.g., parameter "X") may allow for overlapping locations of the downlink control channels (e.g., the location of the downlink control channel may correspond to an SSB index from the QCL SSB set). In some aspects, the downlink control channel may refer to a type 0 PDCCH, such as a common search space PDCCH. In some aspects, the parameter X may be an integer no higher than a defined value (e.g., no greater than 8, where 8 may be the agreed maximum number of SSBs 215 available for transmission). The parameter X may use three bits to carry or convey information. In some aspects, the parameter X may be a subset of an integer, and the set of values that X may take may have a size of 1/2/4/8 or the like (e.g., a power of 2) in order to save the number of bits needed to convey information. In some aspects, the parameter X may be common across all SSBs 215 transmitted by the base station 205. For example, parameter X spans all PBCHs and may be common in all SSBs 215 that are actually transmitted. This may enable the UE 210 to use soft combining techniques for broadcast channel detection of the parameters. In examples where the base station 205 sends the SSB215 in a beamformed transmission, the parameter X may not necessarily be the same as the number of beams, e.g., the parameter X may be larger depending on the base station 205 selection.

Accordingly, UE 210 (e.g., an initial access UE in this example) may receive SSB215 (e.g., SSB 215-d) from a set of QCL SSBs (e.g., multiple instances of SSB 215-d and/or multiple SSBs 215 having the same or similar QCL configuration). The UE 210 may recover the parameter X from the receiving SSB and use the parameter to determine a plurality of downlink control channel positions corresponding to the set of QCL SSBs. As discussed, each instance of SSB215 may have its own associated index value (e.g., SSB215 index "x"). As one example, the UE 210 may receive the SSB 215-d with an SSB index of one (e.g., X ═ 1), and the parameter may indicate a value corresponding to the QCL SSB set (e.g., X ═ 4). For downlink control channel (e.g., PDCCH carrying a grant for RMSI PDSCH) detection, UE 210 may search for or monitor each downlink control channel location corresponding to SSB z, where z mod X ═ X mod X. In the example where X is 1 and X is 4, the UE 210 receives or otherwise monitors a downlink control channel position (PDCCH position) corresponding to an SSB index of 1,5, 9, etc. In some aspects, a PDCCH monitoring occasion "z" may occur only in slots and radio frames on which SSBs can potentially be transmitted, so the UE 210 may check whether the PDCCH monitoring occasion is a potential SSB slot in addition to checking the modulo condition z mod X ═ X mod X to determine whether to monitor the PDCCH for control channel information during the monitoring occasion. In some aspects, the downlink control channel position may be a function of a radio frame number, which may be determined by the PBCH and the maximum number of SSB transmission opportunities.

Accordingly, UE 210 may detect or otherwise receive SSB215 having an index of 1, and SSB indices determined to be 5, 9, etc., based on parameter X are also associated with certain downlink control channel locations. In some aspects, the downlink control channel (e.g., RMSI PDCCH) may be sent in the next frame, the LBT procedure may be independent, and the starting point may be later than x-1, and thus the UE 210 may continue searching. This may enable the UE 210 to identify a location for monitoring downlink control channels corresponding to the QCL SSB set.

Accordingly, the UE 210 may receive a downlink grant for system information (e.g., PDSCH RMSI) based on monitoring and receiving a downlink control channel (e.g., PDCCH) for carrying or transmitting the downlink grant. Based on the downlink grant, the UE 210 may receive system information (e.g., RMSI) and establish a connection with the base station 205 in accordance with the received SSB 215-d (in this example) and the system information.

Another problem related to legacy networks may be related to SSB215 rate matching. For example, in some examples of conventional techniques, system information (e.g., RMSI) may carry or convey a bitmap (e.g., an 8-bit bitmap) that indicates which SSBs 215 within the set of available SSBs 215 are being sent. For example, the base station 205 may have a set of SSBs 215 (e.g., each of the SSBs 215-a through 215-e) that may be transmitted, but may actually transmit only a subset of the SSBs 215 (e.g., such as SSBs 215-a, 215-c, 215-e, etc.). Conventionally, the UE 210 may receive system information in one PDSCH transmission and use the information indicated in the bitmap to configure or otherwise perform rate matching in subsequent PDSCH transmissions around the resource blocks/symbols used in the indicated SSB. However, this conventional technique is based on the following facts: the set of SSBs 215 and/or the actual transmitted SSBs 215 are the same across all frames. Such conventional techniques do not support configurations where SSBs 215 are available and/or actually transmitted to change (e.g., within a discovery period, between different frames or sets of frames, etc.). Thus, in the event that the available and/or actual transmitted SSBs 215 change, the UE 210 may not be able to configure or otherwise perform rate matching.

In addition, the conventional art sets the size of the bitmap to correspond to the maximum size of an available SSB transmission opportunity for a licensed carrier in which an SSB can always be transmitted. In unlicensed carriers (where the transmission must undergo an LBT procedure before transmission), conventional techniques do not configure a much larger number of available SSB transmission opportunities despite the fact that many SSB transmission opportunities may not be available at any particular time due to LBT failure. Thus, the bitmap size may be increased for the maximum size that is expected to be used in an unlicensed system (which would require higher overhead). Therefore, alternative solutions are desired.

Accordingly, aspects of the described technology provide the following mechanisms (e.g., rules): which enables the UE 210 to configure or otherwise perform rate matching for situations where the available and/or actually transmitted SSBs 215 change. In some aspects, a bitmap (e.g., an 8-bit bitmap) indicated in the system information may be used. However, the system information may also carry or convey an indication of the maximum number of SSBs 215 available for use. In some aspects, the maximum number of SSBs 215 available for use may be greater than the total number of SSBs 215 indicated by the bitmap (e.g., due to the bitmap size).

For example, system information (e.g., RMSI) may carry or convey a bitmap indicating a subset of SSBs 215 sent from a set of SSBs 215. As one example, the bitmap may be set to 10101010 to indicate that SSBs 215 with indices of 0, 2, 4, and 6 are actually being sent and that SSBs 215 with indices of 1, 3, 5, and 7 are not being sent. Thus, the set of SSBs 215 can include SSBs 215 having indices 0-7, while the subset of SSBs 215 that are actually being sent includes only SSBs 215 having indices of 0, 2, 4, and 6.

In some aspects, the maximum number of SSBs 215 available for use may be greater than the set of SSBs 215 indicated by the bitmap (e.g., due to the size of the bitmap). For example, the system information (e.g., RMSI) may indicate (e.g., in a parameter) a maximum number of SSBs 215 locations available for use. As one non-limiting example, the maximum number of SSBs 215 available for use may be 12, 16, 24, 32, or some other number of SSBs 215. In some aspects, the maximum number of SSBs 215 available for use may refer to potential SSB215 locations occurring within a particular time window (such as a DRS), within a particular set of timeslots or frames, and so forth.

Based on receiving the system information, the UE 210 can determine or otherwise ascertain: there are 16 (in one example) maximum number of SSBs 215 available for use, and the bitmap indicates the pattern of the actually sent SSBs 215 within the set of SSBs 215 indicated by the bitmap (e.g., on, off, etc. in the example above for the first eight SSBs where the size of the bitmap is eight). In accordance with aspects of the described techniques, the UE 210 may repeat the pattern in the bitmap for SSBs 215 sent after the set of SSBs 215 indicated by the bitmap. For example and for the first eight SSB215 locations, the UE 210 may determine: SSBs 215 with indices of 0, 2, 4, and 6 are actually sent and SSBs 215 with indices of 1, 3, 5, and 7 are not being sent. Repeating the pattern may include the UE 210 determining: for the purpose of rate matching for subsequent PDSCHs, SSBs 215 with indices of 8, 10, 12, 14, etc. are transmitting and SSBs 215 with indices of 9, 11, 13, 15, etc. are not transmitting. Thus, based on the bitmap and the parameters indicated in the system information, the UE 210 may use the following rules: where SSBs 215 that occur after a subset of SSBs 215 (or not just after the set of SSBs 215) and are within the maximum number of SSBs 215 are repeated according to the pattern indicated in the bitmap.

Thus, the UE 210 may receive the bitmap and an indication of the maximum number of SSBs 215 available for use (e.g., in the first RMSI PDSCH), and use this information to configure rate matching for receiving PDSCH transmissions. In some aspects, the UE 210 may use the bitmap and an indication of the maximum number of SSBs 215 available for use to configure or otherwise perform rate matching in subsequent PDSCH transmissions from the base station 205. For example, the UE 210 may use the configured rate matching for the subsequent PDSCH transmission by rate matching around the SSBs 215 indicated as being transmitted in (or concurrently with) the subsequent PDSCH transmission. This may enable the UE 210 to rate match around all potential SSB215 transmissions as indicated by the bitmap with up to the maximum number of SSBs 215 available for use. In some aspects, the UE 210 may also configure the set of rate matching resources into SSBs that are not transmitted (e.g., SSBs 215 with indices of 1, 3, 5, etc., up to the maximum number of SSBs 215 available for use). Thus, the UE 210 may receive PDSCH transmissions according to rate matching configured based on the bitmap and an indication of the maximum number of SSBs 215 available for use.

In some aspects, the described techniques for rate matching configuration may be associated with a particular discovery period (e.g., such as DRS). For example, various aspects of the SSB215 transmissions may change periodically, as needed, according to a schedule, and so forth. Thus, the base station 205 may update the SSB215 based on the change to the SSB215 transmission configuration and the associated time period or window. In one example, the configuration for transmission of SSB215 may be changed for each or some or all DRS periods.

Fig. 3 illustrates an example of an SSB configuration 300 that supports controlling search space overlap indications, in accordance with aspects of the present disclosure. In some examples, SSB configuration 300 may implement aspects of wireless communication systems 100 and/or 200. Aspects of the SSB configuration 300 may be implemented by a base station and/or a UE (which may be examples of corresponding devices described herein).

In broad terms, the SSB configuration 300 illustrates one example of how the SSB 305 may be sent in accordance with aspects of the described techniques. In some aspects, a base station may be configured to: multiple SSBs 305 (only one SSB 305 is labeled for ease of reference) are sent to one or more UEs operating within the coverage area of the base station. For example, SSBs 305 having indices of 0-7 may be considered a first plurality of SSBs configured for potential transmission during a specified time period or window (such as DRS window 215). Accordingly, the base station may transmit multiple SSBs 305 with indices 0-7 during a first DRS window 310-a, multiple SSBs 305 with indices 0-7 during a second DRS window 310-b, and multiple SSBs 305 with indices 0-7 during a third DRS window 310-c. In some aspects, the number and/or configuration for SSBs 305 may vary from one DRS window 310 to the next DRS window 310.

In a broad sense, the initial access UE may use the SSB 305 to ascertain synchronization (at least to some extent) information for the transmitting base station. For example, each SSB 305 may carry or communicate various frequency, timing, spatial, etc. information that may be used by the UE to establish a connection with the base station. In some aspects, multiple SSBs may be transmitted within a given window or time period (such as DRS window 315).

In some aspects, the plurality of SSBs 305 may comprise a set of QCL SSBs. In some aspects, the number of SSBs 305 within a QCL SSB set may be consistent for a given DRS window 310, but may be the same or may vary from one DRS window 310 to the next DRS window 310. In some aspects, the plurality of SSBs 305 may include a plurality of QCL SSB sets. As one non-limiting example, SSBs 305 with indices of 0 and 4 may form a first set of QCL SSBs (indicated by a forward tilted hash pattern), SSBs 305 with indices of 1 and 5 may form a second set of QCL SSBs (indicated by a cross-hash pattern), SSBs 305 with indices of 2 and 6 may form a third set of QCL SSBs (indicated by a reverse tilted hash pattern), and SSBs 305 with indices of 3 and 7 may form a fourth set of QCL SSBs (indicated by a horizontal line hash pattern).

Conventionally, an initial access UE may receive the SSB 305 and, based on the index of the received SSB 305, the UE may know that the index is associated with a corresponding downlink control channel location (e.g., a time, frequency, spatial, or other location for the UE to monitor for PDCCH signals). However, aspects of the described technology support mechanisms in which additional candidate SSB 305 locations may be configured. That is, the plurality of SSBs 305 may include more SSBs 305 than the eight SSBs 305 shown in fig. 3, e.g., may include 12, 16, or some other number of potential SSB 305 locations. In some aspects, the number of SSBs actually sent may be less than the number of possible SSB 305 locations. In this case, each set of QCL SSBs may include more SSBs 305 than the two SSBs 305 discussed in the example above. For example, the first set of QCL SSBs may include SSBs 305 having indices of 0, 4, 8 (not shown), 12 (also not shown), and so on.

Further, some wireless networks may operate in mmW networks, where the base station must perform an LBT procedure before transmitting each (or some or all) SSB 305. As can be appreciated, not every LBT procedure may be successful, and thus, the base station may not be able to send the SSB 305 until the LBT procedure is successful. As a first example and during DRS window 310-a, the LBT procedure may be successful so that the base station can start transmitting SSBs 305 starting with SSB index 0. However, in the second example and during DRS window 310-b, the LBT procedure may not initially pass, but instead pass or succeed in time for the base station to begin transmitting SSBs 305 beginning with SSB index 2. In a third example and during DRS window 310-c, the LBT procedure may fail until such time as SSB 305 with an index of 4 is scheduled for transmission. Thus, the number of SSBs 305 sent may vary depending on whether the LBT procedure was successful. In some examples, the base station may choose to transmit only four SSBs out of the eight SSBs configured to minimize the number of SSBs actually transmitted while ensuring that each set of QCL SSBs from each of the four sets of QCL SSBs is transmitted at least once.

All of these problems may create problems for an initial access UE that desires to establish a connection with a base station. For example, the UE may detect or otherwise receive an SSB 305 having an index of 1. Conventionally, as with conventional techniques that utilize a one-to-one mapping between SSB 305 indices and corresponding downlink control channel locations, the UE will use the received indices of the SSBs 305 to identify locations for monitoring the downlink control channel (e.g., PDCCH). However, this approach can be problematic when multiple SSB indices overlap with the same (or substantially the same) downlink control channel location, such as when using a QCL SSB set or when some of the SSB locations are not transmitted due to LBT failure, for example. For example, when an SSB is detected at location 1, in a legacy system, the UE may look for a PDCCH corresponding to the same QCL near SSB location 1 in a subsequent DRS occasion. However, in the subsequent DRC occasion, the SSB and system information may not be transmitted at location 1, but may be transmitted at location 5 due to LBT failure. Since location 5 and location 1 have the same QCL, the UE will be able to receive system information if the UE has already looked for PDSCH/system information in the vicinity of location 5.

Accordingly, aspects of the described technology provide the following mechanisms: where each SSB 305 has a corresponding index, but the QCL SSB sets may be associated with the same (or substantially similar) downlink control channel location. In some aspects, this may include: the base station configures the SSBs to include or otherwise communicate an indication of a parameter indicating information associated with a downlink control channel position corresponding to a set of QCL SSBs. For example, a parameter (e.g., parameter "X") may be an integer or a subset of integers, depending on the number of bits used to convey an indication of the parameter in each SSB 305. In general, each SSB 305 within a set of QCL SSBs may have the same or substantially similar QCL configuration. In some examples, the parameter may not necessarily depend on the number of beams used to transmit the SSB 305.

The UE may receive the SSB 305 (e.g., SSB index 1, or x ═ 1) and determine the parameters indicated in the SSB 305. The UE may use this information to determine a downlink control channel location corresponding to the set of QCL SSBs. In general, a downlink control channel location may refer to a time, frequency, space, or some other resource used by a base station to transmit a downlink control channel. The UE may receive (e.g., by monitoring) the determined downlink control channel positions corresponding to the set of QCL SSBs to receive a downlink grant for system information (e.g., RMSI PDSCH) at least one of the downlink control channel positions. The UE may receive system information according to the authorization and establish a connection to the base station based on the received SSB 305, system information, and the like.

As discussed, in some aspects, the parameter may carry or convey an indication of an offset between consecutive SSBs 305 within the QCL SSB set. In the example discussed above, the SSB 305 with indices 0 and 4 may be considered the first set of QCL SSBs, where the parameter may indicate a value of "4" in this example to inform the UE of: every third SSB 305 may have or otherwise use the same or similar QCL configuration and/or may be associated with the same or similar PDCCH locations. Thus, a UE receiving the SSB 305 with index 1 may know: SSB 305 with index 5 may use the same or substantially similar QCL configuration.

In some aspects, some or all of the SSBs 305 may be carried or transmitted in the PBCH. Since the same parameters may be repeated in each SSB 305, the UE may perform soft combining across multiple SSBs 305 to determine the indicated parameters.

Fig. 4A and 4B illustrate an example of an SSB configuration 400 that supports controlling search space overlap indication, according to aspects of the present disclosure. In some examples, SSB configuration 400 may implement aspects of wireless communication systems 100 and/or 200, and/or SSB configuration 300. Aspects of SSB configuration 400 may be implemented by a base station and/or a UE (which may be examples of corresponding devices described herein).

As discussed, conventional techniques typically include RMSI PDSCH for carrying or transmitting an indication of an 8-bit bitmap that indicates which set of the maximum number of 8 SSBs is actually being sent. PDSCH transmissions will be rate matched around the resource blocks/symbols used by the indicated SSB. However, this design is based on the following facts: the set of SSBs actually sent is the same across all frames. Therefore, the conventional techniques do not support the following scenarios: where the actual number of SSBs being transmitted and/or available may vary from one frame to the next, from one DRS period to the next DRS period, and so on. In addition, the conventional art sets the size of the bitmap to correspond to the maximum size of an available SSB transmission opportunity for a licensed carrier in which an SSB can always be transmitted. In unlicensed carriers (where the transmission must undergo an LBT procedure before sending), we may wish to configure a much larger number of available SSB transmission opportunities, since many SSB transmission opportunities may not be available at any particular time due to LBT failures. Thus, we can increase the bitmap size for the maximum size that is expected to be used on an unlicensed system, which would require high overhead. Therefore, alternative solutions are desired. Accordingly, aspects of the described techniques support improved rate matching behavior in such scenarios.

For example, the base station may send the maximum number of SSBs 405 available for use. In general, the maximum number of SSBs 405 available for use may refer to the possible locations in which SSB transmissions may occur. In the example shown in fig. 4A, the maximum number of SSBs 405 available for use may include 16 SSB locations, while the maximum number of SSBs 405 available for use shown in fig. 4B may include 12 SSB locations. Other configurations for the maximum number of SSBs 405 available for use may also be used.

In some aspects, bitmaps used in legacy networks may be applied, at least in some aspects, in accordance with the described techniques. For example, the base station may send (and the UE may receive) system information (e.g., RMSI PDSCH) carrying or conveying an indication of a bitmap indicating a subset of SSBs sent from the set of SSBs. Referring to SSB configurations 400-a and 400-b, the bitmap may be set to "10101010" to indicate: the set of SSBs includes SSBs with indices 0-7. In this context, a set of SSBs may refer to each of the SSBs having indices 0-7, where the subset of SSBs actually sent from the set of SSBs may include SSBs having indices 0, 2, 4, and 6 (as indicated by the hash pattern). The information or pattern indicated in the bitmap may refer to a per/bitmap (per/bitmap) SSB 410.

However, in such a scenario, the maximum number of SSBs 405 available for use may be greater than the SSB set (e.g., the maximum number of SSBs 405 available for use may be 16 (as shown in fig. 4A) or 12 (as shown in fig. 4B)). Thus, the base station may also configure the system information to carry or communicate an indication of the maximum number of SSBs 405 available for use (e.g., the maximum SSB location being used). For example, the system information may include a bit or field configured to convey an indication of the maximum number of SSBs available for use (e.g., a fixed count of SSBs used, an end position for the last used SSB, etc.).

In some aspects, a UE may receive system information and recover a bitmap and an indication of a maximum number of SSBs available for use. The UE may use this information to configure rate matching for PDSCH transmissions. In some aspects, this may include the UE repeating the pattern indicated in the bitmap for SSBs occurring after an SSB in the set of SSBs (e.g., occurring after a subset of SSBs actually sent). In the examples discussed above, the modes may generally refer to: a first SSB (SSB index 0) is being sent, no second SSB (SSB index 1) is being sent, a third SSB (SSB index 2) is being sent, no fourth SSB (SSB index 3) is being sent, and so on. The UE may use this mode for the remaining SSBs within the maximum number of SSBs 405 available for use. For example, the UE may know: SSB index 8 will be sent, SSB index 9 will not be sent, SSB index 10 will be sent, and so on (as shown by the bitmap indicated SSB repetition 415). Thus, the UE may use this information based on the bitmap and the maximum number of SSBs 405 available for use for PDSCH rate matching. Reference to an SSB corresponding to an SSB index to be transmitted may also refer to a UE assumption of SSB transmission related to PDSCH rate matching that the base station may not actually be transmitting the particular SSB. In some aspects, the UE may receive a bitmap and an indication of a maximum number of SSBs 405 available for use in a first PDSCH (e.g., RMSI PDSCH) and use the configured rate matching in subsequent PDSCH transmissions (e.g., and non-RMSI PDSCH transmissions). For example, the UE may rate match around the transmitting SSBs during subsequent PDSCH transmissions.

In the example shown in fig. 4B, the UE may use a bitmap (or pattern indicated in the bitmap) and an indication of the maximum number of SSBs used to determine: SSB index 8 is being sent, SSB index 9 is not being sent, SSB index 10 is being sent, and SSB index 11 is not being sent (again, this is shown as SSB repetition 415 indicated by the bitmap). Thus, for subsequent PDSCH transmissions, the UE may use this information to rate match around the SSBs that are actually being transmitted.

Fig. 5 illustrates an example of a process 500 that supports controlling search space overlap indication according to aspects of the present disclosure. In some examples, the process 500 may implement aspects of the wireless communication system 100, 200 and/or the SSB configuration 300, 400. Aspects of process 500 may be performed by base station 505 and/or UE 510 (base station 505 and/or UE 510 may be examples of corresponding devices described herein).

At 515, the base station 505 may transmit (and the UE 510 may receive) SSBs in the set of QCL SSBs. In some aspects, the SSBs may carry or communicate an indication of a parameter indicating information associated with a plurality of downlink control channel positions corresponding to a set of QCL SSBs. In some aspects, the parameters may carry or convey an indication of an offset between consecutive SSBs within the set of QCL SSBs. In some aspects, this may include the base station 505 sending (and the UE 510 receiving) a PBCH portion of the SSB, e.g., the PBCH portion may carry or convey an indication of the parameters.

In some aspects, the UE 510 may receive multiple instances of an SSB (or PBCH portion of an SSB) and recover the parameters using soft combining across the multiple SSBs.

In some aspects, the base station 505 may send multiple SSBs to one or more UEs located within the coverage area of the base station 505. In some aspects, each SSB may additionally transmit or indicate various synchronization information that may be used by such UEs to synchronize, at least to some extent, with base station 505.

At 520, the UE 510 may determine a plurality of downlink control channel positions corresponding to the set of QCL SSBs based at least in part on the parameters. In some aspects, this may include the UE 510 determining an index for each SSB in the set of QCL SSBs. The UE 510 may use the index to determine multiple downlink control channel locations. In some aspects, this may be based on the frame in which the SSB is received and the parameters indicated in the SSB. In some aspects, the multiple downlink control channel locations may refer to a PDCCH common search space of type 0.

At 525, the base station 505 may send a downlink grant for system information based at least in part on the UE 510 monitoring one or more of the downlink control channel locations (and the UE 510 may receive the downlink grant). In some aspects, this may include the UE 510 monitoring each of a plurality of downlink control channel positions in order to receive a downlink grant. For example, the UE 510 may determine: no downlink control information is detected during a first instance of the plurality of downlink control channel positions (e.g., at a first downlink control channel position). Accordingly, the UE 510 may monitor a second instance of the plurality of downlink control channel locations (e.g., at a second, third, fourth, etc., downlink control channel location, as needed) to detect the downlink grant.

At 530, the base station 505 may transmit system information according to the downlink grant (and the UE 510 may receive the system information according to the downlink grant). In some aspects, the system information may refer to the RMSI indicated in the PDSCH transmission from the base station 505. At 535, the base station 505 and the UE 510 can establish a connection based at least in part on the SSB and system information received at 515.

Fig. 6 illustrates an example of a process 600 that supports controlling search space overlap indication in accordance with aspects of the present disclosure. In some examples, the process 600 may implement aspects of the wireless communication system 100, 200 and/or the SSB configuration 300, 400. Aspects of process 600 may be implemented by a base station 605 and/or a UE 610 (base station 605 and/or UE 610 may be examples of corresponding devices described herein).

At 615, the base station 605 can transmit (and the UE 610 can receive) system information for carrying or communicating an indication of a bitmap indicating a subset of SSBs transmitted from a set of SSBs. In some aspects, the system information may also carry or convey an indication of the maximum number of SSBs available for use. In some aspects, the maximum number of SSBs available for use may be greater than the total number of SSBs in the set of SSBs. In some aspects, the system information is transmitted in a previous PDSCH transmission. In some aspects, the system information may refer to an RMSI indicated in a previous PDSCH transmission.

At 620, the UE 610 can configure rate matching based at least in part on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use. In some aspects, this may include: the UE 610 repeats the pattern in the bitmap for a subset of SSBs within the set of SSBs, and for SSBs that occur after the subset of SSBs and that are within the maximum number of SSBs available for use.

At 625, the base station 605 may send the PDSCH transmission based at least in part on rate matching (and the UE 610 may receive the PDSCH transmission based at least in part on rate matching). As discussed, this may include transmitting system information in a previous PDSCH transmission, while the UE 610 performs PDSCH transmission with the base station 605 by rate matching around SSBs transmitted in a subsequent PDSCH transmission. In some aspects, PDSCH transmissions may be received during the same discovery periods (e.g., DRS periods) in which the maximum number of SSBs available for use may be transmitted.

Fig. 7 illustrates a block diagram 700 of an apparatus 705 that supports controlling search space overlap indication, in accordance with aspects of the present disclosure. The device 705 may be an example of aspects of a UE115 as described herein. The device 705 may include a receiver 710, a communication manager 715, and a transmitter 720. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

Receiver 710 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, information related to controlling search space overlap indications, etc.). Information may be passed to other components of the device 705. The receiver 710 may be an example of aspects of the transceiver 1020 described with reference to fig. 10. Receiver 710 can utilize a single antenna or a group of antennas.

The communication manager 715 may perform the following operations: receiving, from a base station, an SSB of a set of QCL SSBs, the SSB including an indication of a parameter indicating information associated with a set of downlink control channel locations corresponding to the set of QCL SSBs; determining a set of downlink control channel locations corresponding to the set of QCL SSBs based on the parameter; receiving a downlink grant for system information based on monitoring one or more downlink control channel locations in a set of downlink control channel locations; receiving system information based on a downlink grant; and establishing a connection with the base station based on the SSB and the received system information. The communication manager 715 may also: receiving system information comprising a bitmap indicating a subset of SSBs transmitted from a set of SSBs, the system information signal further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs; configuring rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use; and receiving a physical downlink shared channel transmission based on the rate matching. The communication manager 715 may be an example of aspects of the communication manager 1010 described herein.

The communication manager 715 or subcomponents thereof may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 715 or subcomponents thereof may be performed by a general purpose processor, a DSP, an Application Specific Integrated Circuit (ASIC), an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in this disclosure.

The communication manager 715 or subcomponents thereof may be physically located at various locations, including being distributed such that some of the functionality is implemented by one or more physical components at different physical locations. In some examples, the communication manager 715 or subcomponents thereof may be separate and distinct components in accordance with various aspects of the present disclosure. In some examples, the communication manager 715 or subcomponents thereof may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof, in accordance with various aspects of the present disclosure.

Transmitter 720 may transmit signals generated by other components of device 705. In some examples, transmitter 720 may be collocated with receiver 710 in a transceiver module. For example, the transmitter 720 may be an example of aspects of the transceiver 1020 described with reference to fig. 10. The transmitter 720 may utilize a single antenna or a group of antennas.

Fig. 8 illustrates a block diagram 800 of an apparatus 805 that supports controlling search space overlap indication, in accordance with aspects of the present disclosure. The device 805 may be an example of aspects of the device 705 or UE115 as described herein. The device 805 may include a receiver 810, a communication manager 815, and a transmitter 850. The device 805 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

Receiver 810 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, information related to controlling search space overlap indications, etc.). Information may be passed to other components of the device 805. The receiver 810 may be an example of aspects of the transceiver 1020 described with reference to fig. 10. Receiver 810 can utilize a single antenna or a group of antennas.

The communication manager 815 may be an example of aspects of the communication manager 715 as described herein. The communication manager 815 may include a QCL SSB manager 820, a PDCCH location manager 825, an RMSI manager 830, a connection manager 835, an SSB parameter manager 840, and a rate matching manager 845. The communication manager 815 may be an example of aspects of the communication manager 1010 described herein.

The QCL SSB manager 820 may receive, from a base station, an SSB of a set of QCL SSBs, the SSB including an indication of a parameter indicating information associated with a set of downlink control channel positions corresponding to the set of QCL SSBs.

PDCCH location manager 825 may determine a set of downlink control channel locations corresponding to the QCL SSB set based on the parameters and receive a downlink grant for the system information based on monitoring one or more downlink control channel locations in the set of downlink control channel locations.

RMSI manager 830 may receive system information based on a downlink grant.

The connection manager 835 may establish a connection with a base station based on the SSB and the received system information.

The SSB parameter manager 840 may receive system information including a bitmap indicating a subset of SSBs sent from the set of SSBs, the system information signal further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs.

The rate matching manager 845 may configure rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use, and receive physical downlink shared channel transmissions based on the rate matching.

The transmitter 850 may transmit signals generated by other components of the device 805. In some examples, transmitter 850 may be collocated with receiver 810 in a transceiver module. For example, the transmitter 850 may be an example of aspects of the transceiver 1020 described with reference to fig. 10. The transmitter 850 may utilize a single antenna or a group of antennas.

Fig. 9 illustrates a block diagram 900 of a communication manager 905 that supports controlling search space overlap indications, in accordance with aspects of the present disclosure. The communication manager 905 may be an example of aspects of the communication manager 715, the communication manager 815, or the communication manager 1010 described herein. The communication manager 905 may include a QCL SSB manager 910, a PDCCH location manager 915, an RMSI manager 920, a connection manager 925, a PBCH manager 930, an SSB index manager 935, an SSB parameter manager 940, a rate matching manager 945, an SSB mode manager 950, and a PDSCH location manager 955. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

The QCL SSB manager 910 may receive, from a base station, an SSB of a set of QCL SSBs, the SSB including an indication of a parameter indicating information associated with a set of downlink control channel positions corresponding to the set of QCL SSBs. In some cases, the parameters include an indication of an offset between consecutive SSBs within the set of QCL SSBs.

PDCCH location manager 915 may determine a set of downlink control channel locations corresponding to the set of QCL SSBs based on the parameters. In some examples, PDCCH location manager 915 may receive downlink grants for system information based on monitoring one or more downlink control channel locations in a set of downlink control channel locations. In some examples, PDCCH location manager 915 may determine that the set of downlink control channel locations is based on the frame in which the SSB is received and the parameters indicated in the SSB.

In some examples, PDCCH location manager 915 may monitor each downlink control channel location in the set of downlink control channel locations. In some examples, PDCCH location manager 915 may determine that no downlink control information was detected during the first instance in the set of downlink control channel locations. In some examples, PDCCH location manager 915 may monitor a second instance of the set of downlink control channel locations based on a parameter to detect a downlink grant. In some cases, the downlink control channel locations in the set of downlink control channel locations include a type 0 physical downlink control channel common search space.

The RMSI manager 920 may receive system information based on a downlink grant.

The connection manager 925 may establish a connection with the base station based on the SSB and the received system information.

SSB parameter manager 940 may receive system information including a bitmap indicating a subset of SSBs sent from the set of SSBs, the system information signal further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs.

The rate matching manager 945 may configure rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use.

In some examples, rate matching manager 945 may receive the physical downlink shared channel transmission based on rate matching.

PBCH manager 930 may receive a physical broadcast channel portion of an SSB that includes an indication of a parameter. In some examples, PBCH manager 930 may perform soft combining across the set of SSBs. In some cases, the indication of the parameter is common across each SSB in the set of SSBs.

SSB index manager 935 may determine an index for each SSB in the QCL SSB set. In some examples, SSB index manager 935 may determine a set of downlink control channel locations based on the index of each SSB in the determined set of QCL SSBs.

SSB pattern manager 950 may repeat patterns in the bitmap for SSB subsets within the set of SSBs and for SSBs that occur after the SSB subset and that are within the maximum number of SSBs available for use.

The PDSCH location manager 955 may receive a previous physical downlink shared channel transmission that includes system information.

In some examples, the PDSCH location manager 955 may decode system information to identify a bitmap where rate matching is not performed on a previous physical downlink shared channel. In some cases, the physical downlink shared channel transmission is received during the same discovery period in which the maximum number of SSBs available for use may be sent.

Fig. 10 shows a diagram of a system 1000 including a device 1005 that supports controlling search space overlap indication, in accordance with aspects of the present disclosure. Device 1005 may be an example of device 705, device 805, or UE115 or include components of device 705, device 805, or UE115 as described herein. The device 1005 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communications manager 1010, an I/O controller 1015, a transceiver 1020, an antenna 1025, a memory 1030, and a processor 1040. These components may be in electronic communication via one or more buses, such as bus 1045.

The communication manager 1010 may perform the following operations: receiving, from a base station, an SSB of a set of QCL SSBs, the SSB including an indication of a parameter indicating information associated with a set of downlink control channel locations corresponding to the set of QCL SSBs; determining a set of downlink control channel locations corresponding to the set of QCL SSBs based on the parameter; receiving a downlink grant for system information based on monitoring one or more downlink control channel locations in a set of downlink control channel locations; receiving system information based on a downlink grant; and establishing a connection with the base station based on the SSB and the received system information. The communication manager 1010 may also perform the following operations: receiving system information comprising a bitmap indicating a subset of SSBs transmitted from a set of SSBs, the system information signal further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs; configuring rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use; and receiving a physical downlink shared channel transmission based on the rate matching.

I/O controller 1015 may manage input and output signals to device 1005. I/O controller 1015 may also manage peripheral devices that are not integrated into device 1005. In some cases, I/O controller 1015 may represent a physical connection or port to an external peripheral device. In some cases, I/O controller 1015 may utilize a signal such as

Such as an operating system or another known operating system. In other cases, I/O controller 1015 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I/O controller 1015 may be implemented as part of a processor. In some cases, a user may interact with device 1005 via I/O controller 1015 or via hardware components controlled by I/O controller 1015.

The transceiver 1020 may communicate bi-directionally via one or more antennas, wired or wireless links as described above. For example, transceiver 1020 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1020 may also include a modem to modulate packets and provide the modulated packets to the antennas for transmission, as well as demodulate packets received from the antennas.

In some cases, a wireless device may include a single antenna 1025. However, in some cases, the device may have more than one antenna 1025 that can send or receive multiple wireless transmissions simultaneously.

Memory 1030 may include RAM and ROM. The memory 1030 may store computer-readable, computer-executable code 1035, comprising instructions that, when executed, cause the processor to perform various functions described herein. In some cases, memory 1030 may contain, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

Processor 1040 may include intelligent hardware devices (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1040 may be configured to operate the memory array using a memory controller. In other cases, a memory controller may be integrated into processor 1040. The processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1030) to cause the device 1005 to perform various functions (e.g., to support functions or tasks to control search space overlap indication).

Code 1035 may include instructions for implementing aspects of the disclosure, including instructions for supporting wireless communications. Code 1035 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, code 1035 may not be directly executable by processor 1040, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

Fig. 11 shows a block diagram 1100 of an apparatus 1105 supporting controlling search space overlap indication in accordance with aspects of the present disclosure. The device 1105 may be an example of aspects of a base station 105 as described herein. The device 1105 may include a receiver 1110, a communication manager 1115, and a transmitter 1120. The device 1105 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

Receiver 1110 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to controlling search space overlap indications, etc.). Information may be passed to other components of the device 1105. The receiver 1110 may be an example of aspects of the transceiver 1420 described with reference to fig. 14. Receiver 1110 can utilize a single antenna or a group of antennas.

The communication manager 1115 may perform the following operations: transmitting a set of SSBs, the set of SSBs comprising a set of QCL SSBs, wherein each SSB in the set of SSBs comprises an indication of a parameter indicating information associated with a set of downlink control channel locations corresponding to the set of QCL SSBs; transmitting a downlink grant for system information on a set of downlink control channel positions corresponding to the set of QCL SSBs based on the parameter; transmitting system information according to the authorization; and establishing a connection with the UE based on the SSB and the system information. The communication manager 1115 may also perform the following operations: transmitting system information including a bitmap indicating a subset of SSBs transmitted from a set of SSBs, the system information further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs; configuring rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use; and performing physical downlink shared channel transmission based on the rate matching. The communication manager 1115 may be an example of aspects of the communication manager 1410 described herein.

The communication manager 1115, or subcomponents thereof, may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 1115, or subcomponents thereof, may be performed by a general purpose processor, a DSP, an Application Specific Integrated Circuit (ASIC), an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in this disclosure.

The communication manager 1115, or subcomponents thereof, may be physically located at various locations, including being distributed such that some of the functionality is implemented by one or more physical components at different physical locations. In some examples, the communication manager 1115, or subcomponents thereof, may be separate and distinct components in accordance with various aspects of the present disclosure. In some examples, the communication manager 1115, or subcomponents thereof, may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in this disclosure, or a combination thereof, in accordance with various aspects of the present disclosure.

The transmitter 1120 may transmit signals generated by other components of the device 1105. In some examples, the transmitter 1120 may be collocated with the receiver 1110 in a transceiver module. For example, the transmitter 1120 may be an example of aspects of the transceiver 1420 described with reference to fig. 14. Transmitter 1120 may utilize a single antenna or a group of antennas.

Fig. 12 shows a block diagram 1200 of an apparatus 1205 that supports controlling search space overlap indications in accordance with aspects of the present disclosure. Device 1205 may be an example of aspects of device 1105 or base station 105 as described herein. The device 1205 may include a receiver 1210, a communication manager 1215, and a transmitter 1250. The device 1205 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

Receiver 1210 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to controlling search space overlap indications, etc.). Information may be passed to other components of the device 1205. The receiver 1210 may be an example of aspects of the transceiver 1420 described with reference to fig. 14. Receiver 1210 can utilize a single antenna or a group of antennas.

The communication manager 1215 may be an example of aspects of the communication manager 1115 as described herein. The communication manager 1215 may include a QCL SSB manager 1220, a PDCCH location manager 1225, a RMSI manager 1230, a connection manager 1235, an SSB parameter manager 1240, and a rate matching manager 1245. The communication manager 1215 may be an example of aspects of the communication manager 1410 described herein.

The QCL SSB manager 1220 may transmit a set of SSBs, the set of SSBs including a set of QCL SSBs, wherein each SSB in the set of SSBs includes an indication of a parameter indicating information associated with a set of downlink control channel positions corresponding to the set of QCL SSBs.

The PDCCH location manager 1225 may send downlink grants for system information on a set of downlink control channel locations corresponding to the set of QCL SSBs based on the parameters.

RMSI manager 1230 may send system information based on the authorization.

The connection manager 1235 may establish a connection with the UE based on the SSB and the system information.

The SSB parameter manager 1240 may transmit system information including a bitmap indicating a subset of SSBs transmitted from the set of SSBs, the system information further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs.

The rate matching manager 1245 may configure rate matching based on the SSB subset indicated by the bitmap and the indicated maximum number of SSBs available for use, and perform physical downlink shared channel transmission based on the rate matching.

Transmitter 1250 may transmit signals generated by other components of device 1205. In some examples, the transmitter 1250 may be collocated with the receiver 1210 in a transceiver module. For example, the transmitter 1250 may be an example of aspects of the transceiver 1420 described with reference to fig. 14. Transmitter 1250 may utilize a single antenna or a group of antennas.

Fig. 13 illustrates a block diagram 1300 of a communications manager 1305 that supports controlling search space overlap indications in accordance with aspects of the present disclosure. The communications manager 1305 may be an example of aspects of the communications manager 1115, the communications manager 1215, or the communications manager 1410 described herein. The communication manager 1305 may include a QCL SSB manager 1310, a PDCCH location manager 1315, an RMSI manager 1320, a connection manager 1325, a PBCH manager 1330, an SSB parameter manager 1335, a rate matching manager 1340, an SSB mode manager 1345, and a PDSCH location manager 1350. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

The QCL SSB manager 1310 may transmit a set of SSBs, the set of SSBs including a set of QCL SSBs, wherein each SSB in the set of SSBs includes an indication of a parameter indicating information associated with a set of downlink control channel positions corresponding to the set of QCL SSBs. In some cases, the parameters include an indication of an offset between consecutive SSBs within the set of QCL SSBs.

PDCCH location manager 1315 may send downlink grants for system information on a set of downlink control channel locations corresponding to the set of QCL SSBs based on the parameters.

The RMSI manager 1320 may transmit system information according to the authorization.

The connection manager 1325 may establish a connection with the UE based on the SSB and the system information.

The SSB parameter manager 1335 may send system information including a bitmap indicating a subset of SSBs sent from the set of SSBs, the system information further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs.

The rate matching manager 1340 may configure rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use. In some examples, rate matching manager 1340 may perform physical downlink shared channel transmission based on rate matching.

PBCH manager 1330 may send a physical broadcast channel portion of an SSB that includes an indication of the parameters. In some cases, the indication of the parameter is common across each SSB in the set of SSBs.

The SSB pattern manager 1345 may repeat the pattern in the bitmap for sending a subset of SSBs within the set of SSBs, and an additional set of SSBs sent after the subset of SSBs and within the maximum number of SSBs available for use.

PDSCH location manager 1350 may perform previous physical downlink shared channel transmissions that include system information.

Fig. 14 shows a diagram of a system 1400 including a device 1405 that supports controlling search space overlap indications, in accordance with aspects of the present disclosure. Device 1405 may be an example of or a component comprising device 1105, device 1205, or base station 105 as described herein. Device 1405 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communications manager 1410, a network communications manager 1415, a transceiver 1420, an antenna 1425, a memory 1430, a processor 1440, and an inter-station communications manager 1445. These components may be in electronic communication via one or more buses, such as bus 1450.

The communication manager 1410 may perform the following operations: transmitting a set of SSBs, the set of SSBs comprising a set of QCL SSBs, wherein each SSB in the set of SSBs comprises an indication of a parameter indicating information associated with a set of downlink control channel locations corresponding to the set of QCL SSBs; transmitting a downlink grant for system information on a set of downlink control channel positions corresponding to the set of QCL SSBs based on the parameter; transmitting system information according to the authorization; and establishing a connection with the UE based on the SSB and the system information. The communication manager 1410 may also perform the following operations: transmitting system information including a bitmap indicating a subset of SSBs transmitted from a set of SSBs, the system information further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs; configuring rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use; and performing physical downlink shared channel transmission based on the rate matching.

The network communication manager 1415 may manage communication with the core network (e.g., via one or more wired backhaul links). For example, the network communication manager 1415 may manage the transmission of data communications for client devices, such as one or more UEs 115.

The transceiver 1420 may communicate bi-directionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 1420 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1420 may also include a modem to modulate packets and provide the modulated packets to the antennas for transmission, as well as demodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 1425. However, in some cases, the device may have more than one antenna 1425 that can send or receive multiple wireless transmissions simultaneously.

Memory 1430 may include RAM, ROM, or a combination thereof. Memory 1430 may store computer-readable code 1435, computer-readable code 1435 including instructions that, when executed by a processor (e.g., processor 1440), cause the device to perform various functions described herein. In some cases, memory 1430 may contain, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

Processor 1440 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combinations thereof). In some cases, processor 1440 may be configured to operate a memory array using a memory controller. In some cases, a memory controller may be integrated into processor 1440. Processor 1440 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1430) to cause device 1405 to perform various functions (e.g., to support functions or tasks that control search space overlap indications).

The inter-station communication manager 1445 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UEs 115 in cooperation with other base stations 105. For example, the inter-station communication manager 1445 may coordinate scheduling for transmissions to the UEs 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, the inter-station communication manager 1445 may provide an X2 interface within LTE/LTE-a wireless communication network technology to provide communication between base stations 105.

The code 1435 may include instructions for implementing aspects of the present disclosure, including instructions for supporting wireless communications. The code 1435 may be stored in a non-transitory computer-readable medium (e.g., system memory or other type of memory). In some cases, code 1435 may not be directly executable by processor 1440, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

FIG. 15 shows a flow diagram illustrating a method 1500 of supporting control of search space overlap indication in accordance with aspects of the present disclosure. The operations of method 1500 may be implemented by UE115 or components thereof as described herein. For example, the operations of method 1500 may be performed by a communication manager as described with reference to fig. 7-10. In some examples, the UE may execute the set of instructions to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described below.

At 1505, the UE may receive an SSB of a set of QCL SSBs from a base station, the SSB including an indication of a parameter indicating information associated with a set of downlink control channel positions corresponding to the set of QCL SSBs. The operations of 1505 may be performed according to methods described herein. In some examples, aspects of the operations of 1505 may be performed by a QCL SSB manager as described with reference to fig. 7-10.

At 1510, the UE may determine a set of downlink control channel locations corresponding to the set of QCL SSBs based on the parameters. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operation of 1510 may be performed by a PDCCH location manager as described with reference to fig. 7-10.

At 1515, the UE may receive a downlink grant for system information based on monitoring one or more downlink control channel locations in the set of downlink control channel locations. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operation of 1515 may be performed by a PDCCH location manager as described with reference to fig. 7-10.

At 1520, the UE may receive system information based on the downlink grant. The operations of 1520 may be performed according to methods described herein. In some examples, aspects of the operations of 1520 may be performed by an RMSI manager as described with reference to fig. 7-10.

At 1525, the UE may establish a connection with the base station based on the SSB and the received system information. Operations of 1525 may be performed according to the methods described herein. In some examples, aspects of the operations of 1525 may be performed by a connection manager as described with reference to fig. 7-10.

FIG. 16 shows a flow diagram illustrating a method 1600 of supporting control of search space overlap indication in accordance with aspects of the present disclosure. The operations of method 1600 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of method 1600 may be performed by a communication manager as described with reference to fig. 11-14. In some examples, the base station may execute sets of instructions to control the functional units of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

At 1605, the base station may transmit a set of SSBs including a set of QCL SSBs, wherein each SSB in the set of SSBs includes an indication of a parameter indicating information associated with a set of downlink control channel positions corresponding to the set of QCL SSBs. The operations of 1605 may be performed in accordance with the methods described herein. In some examples, aspects of the operation of 1605 may be performed by a QCL SSB manager as described with reference to fig. 11-14.

At 1610, the base station may send a downlink grant for system information on a set of downlink control channel locations corresponding to the set of QCL SSBs based on the parameters. The operations of 1610 may be performed according to methods described herein. In some examples, aspects of the operation of 1610 may be performed by a PDCCH location manager as described with reference to fig. 11-14.

At 1615, the base station may transmit system information according to the authorization. The operations of 1615 may be performed according to methods described herein. In some examples, aspects of the operations of 1615 may be performed by an RMSI manager as described with reference to fig. 11-14.

At 1620, the base station may establish a connection with the UE based on the SSB and the system information. The operations of 1620 may be performed according to methods described herein. In some examples, aspects of the operations of 1620 may be performed by a connection manager as described with reference to fig. 11-14.

Fig. 17 shows a flow diagram illustrating a method 1700 of supporting control of search space overlap indication in accordance with aspects of the present disclosure. The operations of method 1700 may be implemented by a UE115 or components thereof as described herein. For example, the operations of method 1700 may be performed by a communication manager as described with reference to fig. 7-10. In some examples, the UE may execute the set of instructions to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described below.

At 1705, the UE may receive system information comprising a bitmap indicating a subset of SSBs transmitted from a set of SSBs, the system information signal further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs. The operations of 1705 may be performed according to methods described herein. In some examples, aspects of the operation of 1705 may be performed by an SSB parameter manager as described with reference to fig. 7-10.

At 1710, the UE may configure rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed by a rate matching manager as described with reference to fig. 7-10.

At 1715, the UE may receive a physical downlink shared channel transmission based on the rate matching. The operations of 1715 may be performed according to methods described herein. In some examples, aspects of the operations of 1715 may be performed by a rate matching manager as described with reference to fig. 7-10.

FIG. 18 shows a flow diagram illustrating a method 1800 of supporting control of search space overlap indications in accordance with aspects of the present disclosure. The operations of method 1800 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of method 1800 may be performed by a communications manager as described with reference to fig. 11-14. In some examples, the base station may execute sets of instructions to control the functional units of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

At 1805, the base station can transmit system information including a bitmap indicating a subset of SSBs transmitted from the set of SSBs, the system information further indicating a maximum number of SSBs available for use, wherein the maximum number of SSBs available for use is greater than a total number of SSBs in the set of SSBs. The operations of 1805 may be performed in accordance with the methodologies described herein. In some examples, aspects of the operations of 1805 may be performed by an SSB parameter manager as described with reference to fig. 11-14.

At 1810, the base station may configure rate matching based on the subset of SSBs indicated by the bitmap and the indicated maximum number of SSBs available for use. The operations of 1810 may be performed in accordance with the methods described herein. In some examples, aspects of the operations of 1810 may be performed by a rate matching manager as described with reference to fig. 11-14.

At 1815, the base station may perform physical downlink shared channel transmission based on rate matching. The operations of 1815 may be performed according to methods described herein. In some examples, aspects of the operations of 1815 may be performed by a rate matching manager as described with reference to fig. 11-14.

It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified, and that other implementations are possible. Further, aspects from two or more of the methods may be combined.

The techniques described herein may be used for various wireless communication systems such as code division multiple access (CMDA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and others. A CDMA system may implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA), and the like. CDMA2000 covers IS-2000, IS-95 and IS-856 standards. The IS-2000 release may be commonly referred to as CDMA 20001X, 1X, etc. IS-856(TIA-856) IS commonly referred to as CDMA 20001 xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes wideband CDMA (W-CDMA) and other variants of CDMA. TDMA systems may implement wireless technologies such as global system for mobile communications (GSM).

The OFDMA system may implement wireless technologies such as Ultra Mobile Broadband (UMB), evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE)802.11(Wi-Fi), IEEE 802.16(WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE, LTE-A and LTE-A Pro are releases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE-A, LTE-APro, NR, and GSM are described in documents from an organization named "3 rd Generation partnership project" (3 GPP). CDMA2000 and UMB are described in documents from an organization named "3 rd generation partnership project 2" (3GPP 2). The techniques described herein may be used for the systems and wireless techniques mentioned herein as well as other systems and wireless techniques. Although aspects of the LTE, LTE-A, LTE-APro, or NR system may be described for purposes of illustration, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may be applied beyond LTE, LTE-A, LTE-A Pro, or NR applications.

A macro cell typically covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider. A small cell may be associated with a lower power base station than a macro cell, and the small cell may operate in the same or different (e.g., licensed, unlicensed, etc.) frequency band as the macro cell. Small cells may include pico cells, femto cells, and micro cells according to various examples. For example, a pico cell may cover a smaller geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider. A femto cell may also cover a smaller geographic area (e.g., a home) and may provide restricted access by UEs having an association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG), UEs for users in the home, etc.). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, pico eNB, femto eNB, or home eNB. An eNB may support one or more (e.g., two, three, four, etc.) cells and may also use one or more component carriers to support communication.

The wireless communication systems described herein may support synchronous or asynchronous operation. For synchronous operation, the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operations.

Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

The various illustrative blocks and modules described in connection with the disclosure herein may be implemented or performed with a general purpose processor, a DSP, an ASIC, an FPGA, or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If embodied in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and the appended claims. For example, due to the nature of software, the functions described herein can be implemented using software executed by a processor, hardware, firmware, hard wiring, or any combination of these. Features implementing functions may also be physically located at various locations, including in a distributed fashion where portions of the functions are implemented at different physical locations.

Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. Non-transitory storage media may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, non-transitory computer-readable media can comprise Random Access Memory (RAM), Read Only Memory (ROM), electrically erasable programmable ROM (eeprom), flash memory, Compact Disc (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Further, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, includes CD, laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

As used herein (including in the claims), an "or" as used in a list of items (e.g., a list of items ending with a phrase such as "at least one of" or "one or more of") indicates an inclusive list such that, for example, a list of at least one of A, B or C means a, or B, or C, or AB, or AC, or BC, or ABC (i.e., a and B and C). Further, as used herein, the phrase "based on" should not be construed as a reference to a closed set of conditions. For example, an exemplary step described as "based on condition a" may be based on both condition a and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on" is interpreted.

In the drawings, similar components or features may have the same reference numerals. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If only the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label or other subsequent reference labels.

The description set forth herein in connection with the appended drawings describes example configurations and is not intended to represent all examples that may be implemented or within the scope of the claims. The term "exemplary" as used herein means "serving as an example, instance, or illustration," and is not "preferred" or "advantageous over other examples. The detailed description includes specific details for the purpose of providing an understanding of the described technology. However, the techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

The description herein is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the present disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (43)

1. A method for wireless communication at a User Equipment (UE), comprising:

receiving, from a base station, a synchronization signal block of a set of quasi co-located synchronization signal blocks, the synchronization signal block comprising an indication of a parameter indicating information associated with a plurality of downlink control channel positions corresponding to the set of quasi co-located synchronization signal blocks;

determining the plurality of downlink control channel positions corresponding to the set of quasi co-located synchronization signal blocks based at least in part on the parameter;

receiving a downlink grant for system information based at least in part on monitoring one or more of the plurality of downlink control channel locations;

receiving the system information based at least in part on the downlink grant; and

establishing a connection with the base station based at least in part on the synchronization signal block and the received system information.

2. The method of claim 1, wherein the parameter comprises an indication of an offset between consecutive synchronization signal blocks within the set of quasi co-located synchronization signal blocks.

3. The method of claim 1, wherein receiving the synchronization signal block comprises:

receiving a physical broadcast channel portion of the synchronization signal block, the physical broadcast channel portion of the synchronization signal block including the indication of the parameter.

4. The method of claim 3, wherein receiving the physical broadcast channel portion of the synchronization block comprises:

soft combining across multiple blocks of synchronization signals is performed.

5. The method of claim 4, wherein the indication of the parameter is common across each of the plurality of synchronization signal blocks.

6. The method of claim 5, wherein the plurality of synchronization signal blocks comprise at least one of: the set of quasi co-located synchronization signal blocks, a plurality of different sets of quasi co-located synchronization signal blocks, each synchronization signal block associated with the base station, or a combination thereof.

7. The method of claim 1, further comprising:

determining an index for each synchronization signal block in the set of quasi co-located synchronization signal blocks,

wherein determining the plurality of downlink control channel positions is based at least in part on the determined index of each synchronization signal block in the set of quasi-co-located synchronization signal blocks.

8. The method of claim 1, wherein:

determining the plurality of downlink control channel positions is based at least in part on a frame in which the synchronization signal block is received and the parameter indicated in the synchronization signal block.

9. The method of claim 1, wherein receiving the downlink grant comprises:

monitoring each of the plurality of downlink control channel locations.

10. The method of claim 1, wherein receiving the downlink grant comprises:

determining that no downlink control information is detected during a first instance in the plurality of downlink control channel positions; and

monitoring a second instance of the plurality of downlink control channel locations based at least in part on the parameter to detect the downlink grant.

11. The method of claim 1, wherein the downlink control channel location of the plurality of downlink control channel locations comprises a type 0 physical downlink control channel common search space.

12. A method for wireless communication at a base station, comprising:

transmitting a plurality of synchronization signal blocks, the plurality of synchronization signal blocks comprising a set of quasi co-located synchronization signal blocks, wherein each synchronization signal block of the plurality of synchronization signal blocks comprises an indication of a parameter indicating information associated with a plurality of downlink control channel positions corresponding to the set of quasi co-located synchronization signal blocks;

transmitting a downlink grant for system information on the plurality of downlink control channel positions corresponding to the set of quasi co-located synchronization signal blocks based at least in part on the parameter;

transmitting the system information according to the authorization; and

establishing a connection with a user equipment based at least in part on the synchronization signal block and the system information.

13. The method of claim 12, wherein the parameter comprises an indication of an offset between consecutive synchronization signal blocks within the set of quasi co-located synchronization signal blocks.

14. The method of claim 12, wherein transmitting the plurality of synchronization signal blocks comprises:

transmitting a physical broadcast channel portion of the synchronization signal block, the physical broadcast portion of the synchronization signal block including the indication of the parameter.

15. The method of claim 14, wherein the indication of the parameter is common across each of the plurality of synchronization signal blocks.

16. A method for wireless communication at a User Equipment (UE), comprising:

receiving system information comprising a bitmap indicating a subset of synchronization signal blocks transmitted from a set of synchronization signal blocks, the system information signal further indicating a maximum number of synchronization signal blocks available for use, wherein the maximum number of synchronization signal blocks available for use is greater than a total number of synchronization signal blocks in the set of synchronization signal blocks;

configuring rate matching based at least in part on the subset of synchronization signal blocks indicated by the bitmap and the indicated maximum number of synchronization signal blocks available for use; and

receiving a physical downlink shared channel transmission based at least in part on the rate matching.

17. The method of claim 16, wherein configuring rate matching comprises:

repeating the pattern in the bitmap for the subset of synchronization signal blocks within the set of synchronization signal blocks and for synchronization signal blocks occurring after the subset of synchronization signal blocks and within the maximum number of synchronization signal blocks available for use.

18. The method of claim 16, wherein receiving the system information comprises:

receiving a previous physical downlink shared channel transmission including the system information; and

decoding the system information to identify the bitmap, wherein rate matching is not performed on the previous physical downlink shared channel.

19. The method of claim 16, wherein the physical downlink shared channel transmission is received during a same discovery period in which the maximum number of synchronization signal blocks available for use can be transmitted.

20. A method for wireless communication at a base station, comprising:

transmitting system information comprising a bitmap indicating a subset of synchronization signal blocks transmitted from a set of synchronization signal blocks, the system information further indicating a maximum number of synchronization signal blocks available for use, wherein the maximum number of synchronization signal blocks available for use is greater than a total number of synchronization signal blocks in the set of synchronization signal blocks;

configuring rate matching based at least in part on the subset of synchronization signal blocks indicated by the bitmap and the indicated maximum number of synchronization signal blocks available for use; and

performing physical downlink shared channel transmission based at least in part on the rate matching.

21. The method of claim 20, further comprising:

repeating the pattern in the bitmap for transmitting the subset of synchronization signal blocks within the set of synchronization signal blocks and a number of additional synchronization signal blocks transmitted after the subset of synchronization signal blocks and within the maximum number of synchronization signal blocks available for use.

22. The method of claim 20, wherein transmitting the system information comprises:

performing a previous physical downlink shared channel transmission including the system information.

23. An apparatus for wireless communication at a User Equipment (UE), comprising:

means for receiving, from a base station, a synchronization signal block of a set of quasi co-located synchronization signal blocks, the synchronization signal block comprising an indication of a parameter indicating information associated with a plurality of downlink control channel positions corresponding to the set of quasi co-located synchronization signal blocks;

means for determining the plurality of downlink control channel positions corresponding to the set of quasi co-located synchronization signal blocks based at least in part on the parameter;

means for receiving a downlink grant for system information based at least in part on monitoring one or more of the plurality of downlink control channel locations;

means for receiving the system information based at least in part on the downlink grant; and

means for establishing a connection with the base station based at least in part on the synchronization signal block and the received system information.

24. The apparatus of claim 23, wherein the parameter comprises an indication of an offset between consecutive synchronization signal blocks within the set of quasi co-located synchronization signal blocks.

25. The apparatus of claim 23, wherein the means for receiving the synchronization signal block further comprises:

means for receiving a physical broadcast channel portion in the synchronization signal block, the physical broadcast channel portion in the synchronization signal block including the indication of the parameter.

26. The apparatus of claim 25, wherein the means for receiving the physical broadcast channel portion of the synchronization block further comprises:

means for performing soft combining across a plurality of synchronization signal blocks.

27. The apparatus of claim 26, wherein the indication of the parameter is common across each of the plurality of synchronization signal blocks.

28. The apparatus of claim 23, further comprising:

means for determining an index of each synchronization signal block in the set of quasi co-located synchronization signal blocks,

wherein determining the plurality of downlink control channel positions is based at least in part on the determined index of each synchronization signal block in the set of quasi-co-located synchronization signal blocks.

29. The apparatus of claim 23, wherein determining the plurality of downlink control channel positions is based at least in part on a frame in which the synchronization signal block is received and the parameter indicated in the synchronization signal block.

30. The apparatus of claim 23, wherein the means for receiving the downlink grant further comprises:

means for monitoring each of the plurality of downlink control channel locations.

31. The apparatus of claim 23, wherein the means for receiving the downlink grant further comprises:

means for determining that no downlink control information is detected during a first instance in the plurality of downlink control channel positions; and

means for monitoring a second instance of the plurality of downlink control channel locations based at least in part on the parameter to detect the downlink grant.

32. The apparatus of claim 23, wherein the downlink control channel position of the plurality of downlink control channel positions comprises a type 0 physical downlink control channel common search space.

33. An apparatus for wireless communication at a base station, comprising:

means for transmitting a plurality of synchronization signal blocks, the plurality of synchronization signal blocks comprising a set of quasi co-located synchronization signal blocks, wherein each synchronization signal block of the plurality of synchronization signal blocks comprises an indication of a parameter indicating information associated with a plurality of downlink control channel positions corresponding to the set of quasi co-located synchronization signal blocks;

means for transmitting a downlink grant for system information on the plurality of downlink control channel positions corresponding to the set of quasi co-located synchronization signal blocks based at least in part on the parameter;

means for transmitting the system information in accordance with the authorization; and

means for establishing a connection with a user equipment based at least in part on the synchronization signal block and the system information.

34. The apparatus of claim 33, wherein the parameter comprises an indication of an offset between consecutive synchronization signal blocks within the set of quasi co-located synchronization signal blocks.

35. The apparatus of claim 33, wherein the means for transmitting the plurality of synchronization signal blocks further comprises:

means for transmitting a physical broadcast channel portion of the synchronization signal block, the physical broadcast portion of the synchronization signal block including the indication of the parameter.

36. The apparatus of claim 35, wherein the indication of the parameter is common across each of the plurality of synchronization signal blocks.

37. An apparatus for wireless communication at a User Equipment (UE), comprising:

means for receiving system information comprising a bitmap indicating a subset of synchronization signal blocks transmitted from a set of synchronization signal blocks, the system information signal further indicating a maximum number of synchronization signal blocks available for use, wherein the maximum number of synchronization signal blocks available for use is greater than a total number of synchronization signal blocks in the set of synchronization signal blocks;

means for configuring rate matching based at least in part on the subset of synchronization signal blocks indicated by the bitmap and the indicated maximum number of synchronization signal blocks available for use; and

means for receiving a physical downlink shared channel transmission based at least in part on the rate matching.

38. The apparatus of claim 37, wherein the means for configuring rate matching further comprises:

means for repeating a pattern in the bitmap for the subset of synchronization signal blocks within the set of synchronization signal blocks and for synchronization signal blocks occurring after the subset of synchronization signal blocks and within the maximum number of synchronization signal blocks available for use.

39. The apparatus of claim 37, wherein the means for receiving the system information further comprises:

means for receiving a previous physical downlink shared channel transmission including the system information; and

means for decoding the system information to identify the bitmap, wherein rate matching is not performed on the previous physical downlink shared channel.

40. The apparatus of claim 37, wherein the physical downlink shared channel transmission is received during a same discovery period in which the maximum number of synchronization signal blocks available for use can be transmitted.

41. An apparatus for wireless communication at a base station, comprising:

means for transmitting system information comprising a bitmap indicating a subset of synchronization signal blocks transmitted from a set of synchronization signal blocks, the system information further indicating a maximum number of synchronization signal blocks available for use, wherein the maximum number of synchronization signal blocks available for use is greater than a total number of synchronization signal blocks in the set of synchronization signal blocks;

means for configuring rate matching based at least in part on the subset of synchronization signal blocks indicated by the bitmap and the indicated maximum number of synchronization signal blocks available for use; and

means for performing physical downlink shared channel transmission based at least in part on the rate matching.

42. The apparatus of claim 41, further comprising:

means for repeating a pattern in the bitmap for transmitting the subset of synchronization signal blocks within the set of synchronization signal blocks and a number of additional synchronization signal blocks transmitted after the subset of synchronization signal blocks and within the maximum number of synchronization signal blocks available for use.

43. The apparatus of claim 41, wherein the means for transmitting the system information further comprises:

means for performing a previous physical downlink shared channel transmission including the system information.

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